Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 28 Jun 2016, 14:24

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Did it take Pei more than 2 hours to walk a distance of 10

Author Message
TAGS:

### Hide Tags

Manager
Joined: 20 Sep 2007
Posts: 106
Followers: 1

Kudos [?]: 59 [4] , given: 0

Did it take Pei more than 2 hours to walk a distance of 10 [#permalink]

### Show Tags

08 May 2008, 20:28
4
KUDOS
12
This post was
BOOKMARKED
00:00

Difficulty:

55% (hard)

Question Stats:

60% (02:14) correct 40% (01:28) wrong based on 617 sessions

### HideShow timer Statistics

Did it take Pei more than 2 hours to walk a distance of 10 miles along a certain trail ( i mile =1.6km rounded to nearest tenth)

(1) Pei walked the distance at an average rate of less than 6.4 km/hr.
(2) On average it took Pei more than 9 minutes per km to walk the distance .
[Reveal] Spoiler: OA
Manager
Joined: 21 Mar 2008
Posts: 81
Followers: 1

Kudos [?]: 13 [0], given: 0

### Show Tags

08 May 2008, 20:56
2
This post was
BOOKMARKED
neeraj.kaushal wrote:
A question from GMAT Prep I get wrong all the ways I did. Anybody knows how to do this

Did it take Pei more than 2 hours to walk a distance of 10 miles along a certain trail ( i mile =1.6km rounded to nearest tenth)

1 Pei walked the distance at an average rate of less than 6.4 km/hr.

2 On average it took Pei more than 9 minutes per km to walk the distance .

1. At most, Pei walked 12.8km in 2 hours. Since the trail is 16km long, then we know that Pei took more than 2 hours. Therefore, statement 1 is sufficient

2. At the fastest, Pei walked 1 km in 9 minutes. Then to walk 16km, the Pei needs 144 minutes, which is more than 2 hours. Therefore, statement 2 is sufficient.
Manager
Joined: 27 Jun 2007
Posts: 200
Followers: 3

Kudos [?]: 30 [1] , given: 0

### Show Tags

11 May 2008, 16:11
1
KUDOS
2
This post was
BOOKMARKED
neeraj.kaushal wrote:
A question from GMAT Prep I get wrong all the ways I did. Anybody knows how to do this

Did it take Pei more than 2 hours to walk a distance of 10 miles along a certain trail ( i mile =1.6km rounded to nearest tenth)

1 Pei walked the distance at an average rate of less than 6.4 km/hr.

2 On average it took Pei more than 9 minutes per km to walk the distance .

I say D.

first, conversions: 10 miles = 16 km

2 hours = 120 minutes

1) less than 6.4km/hr - you want to know if it took less than 2 hours. 6.4 x 2 = 12.8km in two hours, when she has to go 16. You can answer the question if it took more than 2 hours.

Sufficient, eliminate B, C, & E.

2) 9 minutes per km - you want to know if it took less than 2 hours. 16km x 9min = 144 minutes for 16 km, when 120 minutes = 2 hours. You can answer the question if it took longer than two hours.

Sufficient, eliminate A.

D.
Manager
Joined: 18 Aug 2010
Posts: 90
Followers: 1

Kudos [?]: 6 [0], given: 22

### Show Tags

13 Feb 2011, 06:24
guy with 1st statement:

here is my calculation:
if it takes 1 hour to walk max 6.4 km
if will take max. 2.5 hours to walk 16 km.

since it says average rate less than 6.4 so time is less than 2.5 but it could be less than 2.
so im getting that A is not suff. whats wrong with my method ?
pls explain
Math Expert
Joined: 02 Sep 2009
Posts: 33547
Followers: 5944

Kudos [?]: 73746 [2] , given: 9903

### Show Tags

13 Feb 2011, 08:10
2
KUDOS
Expert's post
6
This post was
BOOKMARKED
tinki wrote:
guy with 1st statement:

here is my calculation:
if it takes 1 hour to walk max 6.4 km
if will take max. 2.5 hours to walk 16 km.

since it says average rate less than 6.4 so time is less than 2.5 but it could be less than 2.
so im getting that A is not suff. whats wrong with my method ?
pls explain

distance=rate*time --> rate and time are inversely proportional, which means that if you increase the rate then you'll need less time to cover the same distance and if you decrease the rate you'll need more time to cover the same distance.

So, rate is less than 6.4 kilometers per hour means that time needed to cover 16 kilometers is more than 2.5 hours.

Alternate approach:

Did it take Pei more than 2 hours to walk a distance of 10 miles along a certain trail? (1mile = 1.6 Kilometers, rounded to the nearest tenth)

Basically the question asks whether the rate was less than 10/2=5 miles per hour: is rate<5 miles per hour? Because if it is less than 5 miles per hour, then time needed to cover 10 miles would be more than 2 hours.

(1) Pei walked this distance at an average rate of less than 6.4 kilometers per hour --> rate<6.4 kilometers per hour --> 6.4 kilometer = 6.4/1.6 = 4 miles --> rate<4 miles per hour. Sufficient.

(2) On average, it took Pei more than 9 minutes per Kilometers to walk this distance --> more than 9/60 hours to cover 1 kilometer --> rate<60/9 kilometers per hour (time more - rate less) --> 60/9 kilometers = (60/9)/1.6 = ~4.2 miles --> rate<4.2 miles per hour. Sufficient.

_________________
Manager
Joined: 18 Aug 2010
Posts: 90
Followers: 1

Kudos [?]: 6 [0], given: 22

### Show Tags

13 Feb 2011, 08:58
Bunuel wrote:
tinki wrote:
guy with 1st statement:

here is my calculation:
if it takes 1 hour to walk max 6.4 km
if will take max. 2.5 hours to walk 16 km.

since it says average rate less than 6.4 so time is less than 2.5 but it could be less than 2.
so im getting that A is not suff. whats wrong with my method ?
pls explain

distance=rate*time --> rate and time are inversely proportional, which means that if you increase the rate then you'll need less time to cover the same distance and if you decrease the rate you'll need more time to cover the same distance.

So, rate is less than 6.4 kilometers per hour means that time needed to cover 16 kilometers is more than 2.5 hours.

Alternate approach:

Did it take Pei more than 2 hours to walk a distance of 10 miles along a certain trail? (1mile = 1.6 Kilometers, rounded to the nearest tenth)

Basically the question asks whether the rate was less than 10/2=5 miles per hour: is rate<5 miles per hour? Because if it is less than 5 miles per hour, then time needed to cover 10 miles would be more than 2 hours.

(1) Pei walked this distance at an average rate of less than 6.4 kilometers per hour --> rate<6.4 kilometers per hour --> 6.4 kilometer = 6.4/1.6 = 4 miles --> rate<4 miles per hour. Sufficient.

(2) On average, it took Pei more than 9 minutes per Kilometers to walk this distance --> more than 9/60 hours to cover 1 kilometer --> rate<60/9 kilometers per hour (time more - rate less) --> 60/9 kilometers = (60/9)/1.6 = ~4.2 miles --> rate<4.2 miles per hour. Sufficient.

Thanks... got that
Math Expert
Joined: 02 Sep 2009
Posts: 33547
Followers: 5944

Kudos [?]: 73746 [0], given: 9903

Re: Did it take Pei more than 2 hours to walk a distance of 10 [#permalink]

### Show Tags

27 Jun 2013, 01:02
Expert's post
Bumping for review and further discussion*. Get a kudos point for an alternative solution!

*New project from GMAT Club!!! Check HERE

All DS Distance/Rate Problems to practice: search.php?search_id=tag&tag_id=44
All PS Distance/Rate Problems to practice: search.php?search_id=tag&tag_id=64

_________________
MBA Section Director
Affiliations: GMAT Club
Joined: 22 Feb 2012
Posts: 2656
Location: India
City: Pune
GPA: 3.4
Followers: 320

Kudos [?]: 2313 [1] , given: 1806

Re: Did it take Pei more than 2 hours to walk a distance of 10 [#permalink]

### Show Tags

27 Jun 2013, 12:53
1
KUDOS
Expert's post
Bunuel wrote:
Bumping for review and further discussion*. Get a kudos point for an alternative solution!

*New project from GMAT Club!!! Check HERE

Distance = Speed X Time

Speed = S mph
Distance = 10 miles
Ques = Was the time greater than 2 hours?

If S X 2 = 10, speed becomes 5 mph

when Distance is constant, speed decreases as the time increase. So for Time to be greater than 2 hours, speed should be less than 5 mph

So the question can be rephrased as "Was the speed less than 5mph?"

S1) Speed was less than 6.4 KMPH -----> Speed was less than 4 mph -----Sufficient

S2) Pie took more than 9 minutes per km to walk ------------> S X $$\frac{9}{60}$$ = 1 -----> S = 6.66 -------> Speed was less than 6.66 kmph -----------> Speed was less than 4.xxx mph --- Sufficient

Choice D.
_________________
Senior Manager
Joined: 13 May 2013
Posts: 472
Followers: 2

Kudos [?]: 131 [1] , given: 134

Re: Did it take Pei more than 2 hours to walk a distance of 10 [#permalink]

### Show Tags

28 Jul 2013, 10:42
1
KUDOS
Did it take Pei more than 2 hours to walk a distance of 10 miles along a certain trail ( i mile =1.6km rounded to nearest tenth)

Because both statements are in km, let's convert miles to km:

Did it take Pei more than 2 hours to walk a distance of 16km?

(1) Pei walked the distance at an average rate of less than 6.4 km/hr.

With #1, the fastest Pei could have walked in two hours was 12.8km which is far short of the 16km the question asks. Therefore, Pei took more than 2 hours to walk 16km.
SUFFICIENT

(2) On average it took Pei more than 9 minutes per km to walk the distance.
The stem tells us that Pei walked 16km. If his average was at a minimum, 9minutes/km then it would have taken him minimally 9minutes/16km = 151 minutes which is obviously greater than 120 minutes/2 hours.
SUFFICIENT

(D)
Director
Joined: 29 Nov 2012
Posts: 900
Followers: 12

Kudos [?]: 823 [0], given: 543

Re: Did it take Pei more than 2 hours to walk a distance of 10 [#permalink]

### Show Tags

23 Oct 2013, 02:55
Statement 1 says R < 6.4

So in 2 hours the rate would be D < 6.4 ( rate) * 2 ( time)

So distance < 12.8 so it has to take more than 2 hours to complete 16 km

Sufficient

Statement 2 9 minutes for 1 km => for 16 km it will take 144 minutes which is more than 2 hours its sufficient!

_________________

Click +1 Kudos if my post helped...

Amazing Free video explanation for all Quant questions from OG 13 and much more http://www.gmatquantum.com/og13th/

GMAT Prep software What if scenarios gmat-prep-software-analysis-and-what-if-scenarios-146146.html

Intern
Joined: 21 Mar 2013
Posts: 14
Followers: 0

Kudos [?]: 3 [0], given: 13

Re: Did it take Pei more than 2 hours to walk a distance of 10 [#permalink]

### Show Tags

23 Jul 2014, 14:35
9 min/km * 16 km = 144 minutes

120 min < 144 min (min duration)

so time is more than 2 hours
GMAT Club Legend
Joined: 09 Sep 2013
Posts: 10225
Followers: 482

Kudos [?]: 124 [0], given: 0

Re: Did it take Pei more than 2 hours to walk a distance of 10 [#permalink]

### Show Tags

24 Jul 2015, 01:41
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Intern
Joined: 04 Jun 2015
Posts: 29
Followers: 1

Kudos [?]: 7 [0], given: 1

Did it take Pei more than 2 hours to walk a distance of 10 [#permalink]

### Show Tags

09 Jan 2016, 00:57
neeraj.kaushal wrote:
Did it take Pei more than 2 hours to walk a distance of 10 miles along a certain trail ( i mile =1.6km rounded to nearest tenth)

(1) Pei walked the distance at an average rate of less than 6.4 km/hr.
(2) On average it took Pei more than 9 minutes per km to walk the distance .

From (1) Rate< 6.4 kph
OR$$\frac{Dist.}{Time}$$< 6.4

===>$$\frac{16(km)}{Time}$$<6.4
===> Time>2.5 (Sufficient)

From (2) $$Avg =\frac{Sum}{#}$$
===> $$>$$ 9= Sum/16
===> Sum= $$>$$144 min or$$>$$2.4 hrs (Sufficient)
Hence, D
_________________

Sortem sternit fortem!

Did it take Pei more than 2 hours to walk a distance of 10   [#permalink] 09 Jan 2016, 00:57
Similar topics Replies Last post
Similar
Topics:
10 Did it take a certain ship less than 3 hours to travel 9 kilometers? 7 23 Jun 2015, 02:16
2 Did United States carriers use more than 10 billion gallons of jet fue 2 11 Dec 2014, 07:15
23 How many hours did it take Dale to drive 8 20 Dec 2011, 07:47
It takes 3.5 hours for Mathew to row a distance of X miles 3 24 Apr 2011, 13:16
10 For each landscaping job that takes more than 4 hours, a 7 08 Oct 2009, 17:15
Display posts from previous: Sort by