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A hiker walking at a constant rate of 4 miles per hour is pa

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A hiker walking at a constant rate of 4 miles per hour is pa [#permalink]

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09 Nov 2010, 07:01
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A hiker walking at a constant rate of 4 miles per hour is passed by a cyclist travelling in the same direction along the same path at a constant rate of 20 miles per hour. the cyclist stops & waits for the hiker 5 min after passing her while the hiker continues to walk at her constant rate. how many minutes must the cyclist wait until the hiker catches up

A. 6 2/3
B. 15
C. 20
D. 25
E. 26 2/3
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09 Nov 2010, 07:09
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anilnandyala wrote:
a hiker walking at a constant rate of 4 miles per hour is passed by a cyclist travelling in the same direction along the same path at a constant rate of 20 miles per hour. the cyclist stops & waits for the hiker 5 min after passing her while the hiker continues to walk at her constant rate. how many minutes must the cyclist wait until the hiker catches up
a 6 2/3
b 15
c 20
d 25
e 26 2/3

i am getting 25 how it is 20

In 1/12 hours (5 minutes) after the hiker is passed by the cyclist the distance between them will comprise $$(20-4)*\frac{1}{12}=\frac{4}{3}$$ miles (note that during these 5 minute hiker walks too, so their relative rate is 20-4 miles per hour). The hiker thus will need $$\frac{\frac{4}{3}}{4}=\frac{1}{3}$$ hours, or 20 minutes to catch up.

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Re: a hiker walking at a constant rate [#permalink]

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09 Nov 2010, 08:42
Cyclist travelled for 5 mins (1/12 hours) before stopping.

Distance between Cyclist & hawker= (1/12)*(20-4) = 4/3 miles.

Hawker should cover this distance with 4 hours/mile = (4/3)/(4/1)= 1/3hour = 20 minutes.

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Re: a hiker walking at a constant rate [#permalink]

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09 Nov 2010, 08:48
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cyclist is relatively 4times faster
So in 5 minutes, he has taken the lead for 20 minutes relative to the Hiker.

So he has to wait for 20 minutes

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Re: a hiker walking at a constant rate [#permalink]

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09 Nov 2010, 09:16
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Hiker's speed : Cyclist's speed = 4 : 20 = 1 : 5
To cover the same distance, Time taken by Hiker : Time taken by Cyclist = 5 : 1

(If distance is same, speed is inversely proportional to time)

If cyclist took 5 mins, Hiker will take 25 mins. So she will need another 20 mins. (When cyclist was covering the distance in 5 mins, the Hiker was also walking for those 5 mins)
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Get started with Veritas Prep GMAT On Demand for $199 Veritas Prep Reviews Kudos [?]: 17843 [15], given: 235 Manager Joined: 26 Sep 2013 Posts: 218 Kudos [?]: 181 [0], given: 40 Concentration: Finance, Economics GMAT 1: 670 Q39 V41 GMAT 2: 730 Q49 V41 Re: A hiker walking at a constant rate of 4 miles per hour is pa [#permalink] Show Tags 15 Oct 2013, 20:23 anilnandyala wrote: A hiker walking at a constant rate of 4 miles per hour is passed by a cyclist travelling in the same direction along the same path at a constant rate of 20 miles per hour. the cyclist stops & waits for the hiker 5 min after passing her while the hiker continues to walk at her constant rate. how many minutes must the cyclist wait until the hiker catches up A. 6 2/3 B. 15 C. 20 D. 25 E. 26 2/3 The cyclist is traveling at a pace of 1 mile every 3 minutes. The hiker is traveling at a pace of 1 mile every 15 minutes. The cyclist passes the hiker, and then 5 minutes later stops, so they are $$\frac{5}{3}$$ of a mile from the point they passed the hiker. The hiker is $$\frac{1}{3}$$of a mile past the spot where they were passed. $$\frac{5}{3}$$ - $$\frac{1}{3}$$ = $$\frac{4}{3}$$of a mile, this is how far ahead the cyclist is from the hiker while they wait. since the hiker takes 15 minutes per mile, it will take $$\frac{4}{3}$$*15=$$\frac{60}{3}$$=20 minutes to catch up to the cyclist. Kudos [?]: 181 [0], given: 40 Manager Joined: 13 Jun 2012 Posts: 130 Kudos [?]: 84 [0], given: 333 Location: United States WE: Supply Chain Management (Computer Hardware) Re: A hiker walking at a constant rate of 4 miles per hour is pa [#permalink] Show Tags 07 Aug 2015, 02:51 walking guy's speed in miles/min=4/60=1/15. guy in the cycle=20/60=1/3. So it will be = 1/3-1/15=4/3 thats the speed of the cyclist. now how time will it take to cover 4/3 for the walking guy= 4/3/1/15=20 Kudos [?]: 84 [0], given: 333 Manager Joined: 13 Apr 2015 Posts: 76 Kudos [?]: 22 [0], given: 325 Concentration: General Management, Strategy GMAT 1: 620 Q47 V28 GPA: 3.25 WE: Project Management (Energy and Utilities) Re: A hiker walking at a constant rate of 4 miles per hour is pa [#permalink] Show Tags 31 Aug 2015, 09:46 According to my understanding, when moving in same direction, time taken to chatch is represented by - Initial Diference Btwn them/ Difference of their speeds. And When in opposite direction, time taken to meet is represented by - Initial difference btwn then/ Sum of their speeds. Since they are moving in same direction, the equation is (4/3)/16 * 60, (4/3)- Distance Btwn them. 16- Diference in their speeds (as they are moving in same direction) 60- converting Hrs into mins. which comes out to be 5. Can anyone tell where iam going wrong. Kudos [?]: 22 [0], given: 325 Director Joined: 17 Dec 2012 Posts: 623 Kudos [?]: 535 [1], given: 16 Location: India Re: A hiker walking at a constant rate of 4 miles per hour is pa [#permalink] Show Tags 29 May 2017, 03:33 1 This post received KUDOS Expert's post anilnandyala wrote: A hiker walking at a constant rate of 4 miles per hour is passed by a cyclist travelling in the same direction along the same path at a constant rate of 20 miles per hour. the cyclist stops & waits for the hiker 5 min after passing her while the hiker continues to walk at her constant rate. how many minutes must the cyclist wait until the hiker catches up A. 6 2/3 B. 15 C. 20 D. 25 E. 26 2/3 1. Let us start at the point when the cyclist and the hiker are together 2. In 5 min, cyclist travels 20/12 miles, whereas the hiker travels 4/12 miles. 3. The hiker has to make up 20/12 - 4/12 miles which is 4/3 miles. 4. Time to travel 4/3 miles by the hiker is 4/3 /(4) = 4/12 hrs = 20 min. _________________ Srinivasan Vaidyaraman Sravna http://www.sravnatestprep.com/regularcourse.php Premium Material Standardized Approaches Kudos [?]: 535 [1], given: 16 BSchool Forum Moderator Joined: 17 Jun 2016 Posts: 449 Kudos [?]: 214 [0], given: 199 Location: India GMAT 1: 720 Q49 V39 GMAT 2: 710 Q50 V37 GPA: 3.65 WE: Engineering (Energy and Utilities) Re: A hiker walking at a constant rate of 4 miles per hour is pa [#permalink] Show Tags 25 Jun 2017, 12:36 anilnandyala wrote: A hiker walking at a constant rate of 4 miles per hour is passed by a cyclist travelling in the same direction along the same path at a constant rate of 20 miles per hour. the cyclist stops & waits for the hiker 5 min after passing her while the hiker continues to walk at her constant rate. how many minutes must the cyclist wait until the hiker catches up A. 6 2/3 B. 15 C. 20 D. 25 E. 26 2/3 Speed of Hiker = 4m/hr Speed of Cyclist = 20 m/hr Since both are moving in the same direction, the effective speed of the cyclist = 20-4 = 16 m/hr So with this speed, the cyclist will travel = (16/60)*5 miles in 5 mins = 4/3 miles Hence, Hiker will take = (4/3)/4 hr to travel 4/3 miles at the speed of 4m/hr So, Time required by hiker = 1/3 hr = 20 mins Option C _________________ Kudos [?]: 214 [0], given: 199 Manager Status: love the club... Joined: 24 Mar 2015 Posts: 199 Kudos [?]: 17 [0], given: 451 Re: A hiker walking at a constant rate of 4 miles per hour is pa [#permalink] Show Tags 17 Jul 2017, 11:25 krushna wrote: cyclist is relatively 4times faster So in 5 minutes, he has taken the lead for 20 minutes relative to the Hiker. So he has to wait for 20 minutes hi how can you say cyclist is 4 times faster while cyclist's mph is 20 and hiker's mph is 4..? we can see he is 5 times faster please make it clear to me.. thanks Kudos [?]: 17 [0], given: 451 Manager Status: love the club... Joined: 24 Mar 2015 Posts: 199 Kudos [?]: 17 [0], given: 451 Re: A hiker walking at a constant rate of 4 miles per hour is pa [#permalink] Show Tags 17 Jul 2017, 11:48 VeritasPrepKarishma wrote: Hiker's speed : Cyclist's speed = 4 : 20 = 1 : 5 To cover the same distance, Time taken by Hiker : Time taken by Cyclist = 5 : 1 (If distance is same, speed is inversely proportional to time) If cyclist took 5 mins, Hiker will take 25 mins. So she will need another 20 mins. (When cyclist was covering the distance in 5 mins, the Hiker was also walking for those 5 mins) hi if the hiker were not walking, he would need 25 minutes to cover the distance passed by the cyclist ...? am i right...? thanks in advance .. Kudos [?]: 17 [0], given: 451 Veritas Prep GMAT Instructor Joined: 16 Oct 2010 Posts: 7745 Kudos [?]: 17843 [0], given: 235 Location: Pune, India Re: A hiker walking at a constant rate of 4 miles per hour is pa [#permalink] Show Tags 17 Jul 2017, 23:46 ssislam wrote: VeritasPrepKarishma wrote: Hiker's speed : Cyclist's speed = 4 : 20 = 1 : 5 To cover the same distance, Time taken by Hiker : Time taken by Cyclist = 5 : 1 (If distance is same, speed is inversely proportional to time) If cyclist took 5 mins, Hiker will take 25 mins. So she will need another 20 mins. (When cyclist was covering the distance in 5 mins, the Hiker was also walking for those 5 mins) hi if the hiker were not walking, he would need 25 minutes to cover the distance passed by the cyclist ...? am i right...? thanks in advance .. I am not sure what you mean. If the hiker were not walking, how would he catch up to the cyclist? _________________ Karishma Veritas Prep | GMAT Instructor My Blog Get started with Veritas Prep GMAT On Demand for$199

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Re: A hiker walking at a constant rate of 4 miles per hour is pa [#permalink]

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18 Jul 2017, 22:02
VeritasPrepKarishma wrote:
ssislam wrote:
VeritasPrepKarishma wrote:
Hiker's speed : Cyclist's speed = 4 : 20 = 1 : 5
To cover the same distance, Time taken by Hiker : Time taken by Cyclist = 5 : 1

(If distance is same, speed is inversely proportional to time)

If cyclist took 5 mins, Hiker will take 25 mins. So she will need another 20 mins. (When cyclist was covering the distance in 5 mins, the Hiker was also walking for those 5 mins)

hi

if the hiker were not walking, he would need 25 minutes to cover the distance passed by the cyclist ...? am i right...?

I am not sure what you mean. If the hiker were not walking, how would he catch up to the cyclist?

hi

maybe it is very obvious....

but I wanted to mean, if the hiker stopped walking as early as the cyclist passed him, and the cyclist continued to run his cycle for 5 minutes, then the time required by the hiker to cover the distance passed by the cyclist would be 25 minutes, provided that the hiker starts walking after 5 minutes....

am I right, mam...?

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Re: A hiker walking at a constant rate of 4 miles per hour is pa [#permalink]

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18 Jul 2017, 23:49
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ssislam wrote:
hi

maybe it is very obvious....

but I wanted to mean, if the hiker stopped walking as early as the cyclist passed him, and the cyclist continued to run his cycle for 5 minutes, then the time required by the hiker to cover the distance passed by the cyclist would be 25 minutes, provided that the hiker starts walking after 5 minutes....

am I right, mam...?

Yes, this is correct. He will take 25 mins to cover the distance. If he were not walking for those 5 mins while the cyclist was cycling away, he would take 25 mins to reach the cyclist.
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Re: A hiker walking at a constant rate of 4 miles per hour is pa [#permalink]

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19 Jul 2017, 11:01
anilnandyala wrote:
A hiker walking at a constant rate of 4 miles per hour is passed by a cyclist travelling in the same direction along the same path at a constant rate of 20 miles per hour. the cyclist stops & waits for the hiker 5 min after passing her while the hiker continues to walk at her constant rate. how many minutes must the cyclist wait until the hiker catches up

A. 6 2/3
B. 15
C. 20
D. 25
E. 26 2/3

Rather than the calculation part, all the difficulties is hidden in this line "the cyclist stops & waits for the hiker 5 min after passing her while the hiker continues to walk at her constant rate"

Initially I thought cyclist waited for 5 min, although the meaning is, cyclist stopped and waited after 5 min when he/she crosses the hiker.

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Re: A hiker walking at a constant rate of 4 miles per hour is pa [#permalink]

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20 Jul 2017, 16:50
anilnandyala wrote:
A hiker walking at a constant rate of 4 miles per hour is passed by a cyclist travelling in the same direction along the same path at a constant rate of 20 miles per hour. the cyclist stops & waits for the hiker 5 min after passing her while the hiker continues to walk at her constant rate. how many minutes must the cyclist wait until the hiker catches up

A. 6 2/3
B. 15
C. 20
D. 25
E. 26 2/3

We are given that a cyclist travels at a rate of 20 mph, passes a hiker, and then stops to wait for the hiker after traveling for 5 minutes. Since 5 minutes = 1/12 hours, the cyclist travels a distance of 20/12 = 5/3 miles.

We let the extra time, in hours, of the hiker = t, and then the hiker’s total time is t + 1/12; thus, the distance in miles of the hiker is 4(t + 1/12) = 4t + 1/3.

Since the hiker catches the cyclist, we set their distances equal and determine t:

4t + ⅓ = 5/3

4t = 4/3

t = (4/3)/4 = 4/12 = 1/3 hours = 20 minutes

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Re: A hiker walking at a constant rate of 4 miles per hour is pa [#permalink]

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29 Sep 2017, 21:40
I approached this by calculating how far ahead of the walker the biker is when he's waiting. This is calculated by:

(Biker Speed - Walker Speed) * Time until biker stops to wait
(20 - 4) * 6 = 16*4 = 80km

Then i calculated how long it would take for the walker to walk this distance.
4*t = 80
t = 20

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Re: A hiker walking at a constant rate of 4 miles per hour is pa   [#permalink] 29 Sep 2017, 21:40
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