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Walking at 8KMPH From Point A to Point railway station, mike [#permalink]

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09 Oct 2011, 10:53

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Walking at 8KMPH From Point A to Point railway station, mike will miss the train by 5 minutes. If he walks at 10KMPH he will reach the station by 5 minutes early.What is the distance between Point A to Railway station?

Walking at 8KMPH From Point A to Point railway station, mike will miss the train by 5 minutes. If he walks at 10KMPH he will reach the station by 5 minutes early.What is the distance between Point A to Railway station?

A)9KM B)6.66KM C)7.25KM D)12.40KM E)13KM

Alternatively, don't assume any variables.

Ratio of speed in 2 cases = 8:10 = 4:5 Ratio of time in the 2 cases = 5:4 The difference between the time is total 10 mins so time taken in the two cases must be 50 min and 40 mins respectively. Distance = 8 km/hr * (50/60) hrs = 6.66 km

You will be surprised how quickly you can solve questions using ratios (and without writing anything down once you get used to it - that probably accounts for a lot of time saving)

Re: Walking at 8KMPH From Point A to Point railway station, mike [#permalink]

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11 Aug 2014, 06:01

VeritasPrepKarishma wrote:

gopu106 wrote:

Walking at 8KMPH From Point A to Point railway station, mike will miss the train by 5 minutes. If he walks at 10KMPH he will reach the station by 5 minutes early.What is the distance between Point A to Railway station?

A)9KM B)6.66KM C)7.25KM D)12.40KM E)13KM

Alternatively, don't assume any variables.

Ratio of speed in 2 cases = 8:10 = 4:5 Ratio of time in the 2 cases = 5:4 The difference between the time is total 10 mins so time taken in the two cases must be 50 min and 40 mins respectively. Distance = 8 km/hr * (50/60) hrs = 6.66 km

You will be surprised how quickly you can solve questions using ratios (and without writing anything down once you get used to it - that probably accounts for a lot of time saving)

Walking at 8KMPH From Point A to Point railway station, mike will miss the train by 5 minutes. If he walks at 10KMPH he will reach the station by 5 minutes early.What is the distance between Point A to Railway station?

A)9KM B)6.66KM C)7.25KM D)12.40KM E)13KM

Alternatively, don't assume any variables.

Ratio of speed in 2 cases = 8:10 = 4:5 Ratio of time in the 2 cases = 5:4 The difference between the time is total 10 mins so time taken in the two cases must be 50 min and 40 mins respectively. Distance = 8 km/hr * (50/60) hrs = 6.66 km

You will be surprised how quickly you can solve questions using ratios (and without writing anything down once you get used to it - that probably accounts for a lot of time saving)

Karishma, Can you please explain how you got that the times must be 40 and 50 minutes?

Ratio of time taken is 5:4. This is a difference of 1. Actually the difference between time taken is 10 mins. This means, actual values have a multiplier of 10. So time taken must be 5*10 = 50 mins and 4*10 = 40 mins

Read up on ratio scale and actual values on the links given in the post above.
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Re: Walking at 8KMPH From Point A to Point railway station, mike [#permalink]

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19 Sep 2015, 10:26

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Walking at 8KMPH From Point A to Point railway station, mike [#permalink]

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05 Oct 2015, 20:10

[quote="VeritasPrepKarishma"][quote="gopu106"]Walking at 8KMPH From Point A to Point railway station, mike will miss the train by 5 minutes. If he walks at 10KMPH he will reach the station by 5 minutes early.What is the distance between Point A to Railway station?

Walking at 8KMPH From Point A to Point railway station, mike will miss the train by 5 minutes. If he walks at 10KMPH he will reach the station by 5 minutes early.What is the distance between Point A to Railway station?

please explain me how the time ratio is 5:4 ?

The two speeds are 8 and 10. This is a ratio of 4:5. The ratio of time taken is inverse of the ratio of speeds if distance covered is the same in two cases. So given that the distance covered is same, if ratio of speeds is 4:5, the ratio of time taken will be 5:4.

Walking at 8KMPH From Point A to Point railway station, mike will miss the train by 5 minutes. If he walks at 10KMPH he will reach the station by 5 minutes early.What is the distance between Point A to Railway station?

A)9KM B)6.66KM C)7.25KM D)12.40KM E)13KM

Since time differences given are in minutes so let's convert speed in Km per minute

8 kmph = 8/60 km per minute = (2/15) km per minute 10 kmph = 10/60 km per minute = (1/6) km per minute

Let, Time of train to depart from station = t minutes

Distance between Point A and Railway Station = Speed*Time = (2/15)*(t+5)

Distance between Point A and Railway Station = Speed*Time = (1/6)*(t-5)

i.e. (2/15)*(t+5) = (1/6)*(t-5) i.e. 12t+60 = 15t - 75

i.e. 3t = 135 i.e. t = 45 minutes

i.e. Distance = (1/6)*(t-5) = (1/6)*(45-5) = 40/6 = 20/3 Km = 6.66 Km

Perhaps I am overlooking the issue- I am making some silly mistake please correct me I am getting confused with units (km/hr & mins)

I converted 5 mins to 'hr' since the rate given is km/hr

so i got

8(t-1/12) = 10(t+1/12)

I am getting incorrect answer , please let me know how can you directly consider t+5 & t-5

Thanks in advance!!

Don't always make mathematical equation but also look at relevance of the equation formed

you formed an equation 8(t-1/12) = 10(t+1/12)

when you know speed is less (i.e.8 kmph) then time should be more (i.e. (t+1/12) ) whereas you have taken less speed and less time on one sie and more speed and more time on other side and have equated them which is not logically relevant.

Less speed will take more time and More speed will take less time to travel the same distance.

I hope this helps!!!

P.S. (Similar logical aspect of an equation/inequation are greatly helpful in topic like Inequality)
_________________

Walking at 8KMPH From Point A to Point railway station, mike [#permalink]

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28 Jan 2016, 02:04

g106 wrote:

Walking at 8KMPH From Point A to Point railway station, mike will miss the train by 5 minutes. If he walks at 10KMPH he will reach the station by 5 minutes early.What is the distance between Point A to Railway station?

A)9KM B)6.66KM C)7.25KM D)12.40KM E)13KM

Another approach is testing the answers.

We need to find the distance that makes the difference between times 10 min.

convert speeds to km/min

S1= 2/15 & S2=1/6. To be strategic I will start by choice 'B' or 'D'

When scanning the answer all fraction is easy to recognize

Chioice B= 6.66= 6 2/3=20/3.................T1=20/3 *15/2=50 min & T2= 20/3* 6= 40 min...... Then difference is 10 min

Answer: B

gmatclubot

Walking at 8KMPH From Point A to Point railway station, mike
[#permalink]
28 Jan 2016, 02:04

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