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

It is currently 21 Aug 2014, 10:15

Close

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
Your Progress

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

It took the bus 4 hours to get from town A to town B. What

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Current Student
User avatar
Joined: 11 May 2008
Posts: 559
Followers: 7

Kudos [?]: 20 [0], given: 0

GMAT Tests User
It took the bus 4 hours to get from town A to town B. What [#permalink] New post 02 Aug 2008, 01:45
It took the bus 4 hours to get from town A to town B. What was the average speed of the bus for the trip?

1.In the first 2 hours the bus covered 100 miles
2.The average speed of the bus for the first half of the distance was twice its speed for the second half
Director
Director
avatar
Joined: 27 May 2008
Posts: 552
Followers: 5

Kudos [?]: 171 [0], given: 0

GMAT Tests User
Re: DATA INSUFF.. [#permalink] New post 02 Aug 2008, 05:57
arjtryarjtry wrote:
It took the bus 4 hours to get from town A to town B. What was the average speed of the bus for the trip?

1.In the first 2 hours the bus covered 100 miles
2.The average speed of the bus for the first half of the distance was twice its speed for the second half


average speed = total distance / total time = d/4

so we have to find out d

statement 1 : we dont know the distance the bus covered in second two hours.. not suff
statement 2 : d/(2t1) = 2d/(2t2)
t2 = 2t1
we know t1+t2 = 4
so t1 = 4/3
and t2 = 8/3
still we cant find d ... so not suff

combine two statements

distance covered in 2 hours = distance covered in t1 (4/3) hours + distance covered in (2-4/3) hours
100 = d/2 + d/(2t2) * (2-4/3)
100 = d/2 + 3d/(2*8) * ((6-4)/3)
100 = d/2 + d/8

suff... actually no need to solve it. we know we can find d and the average speed.... Option C
Current Student
User avatar
Joined: 11 May 2008
Posts: 559
Followers: 7

Kudos [?]: 20 [0], given: 0

GMAT Tests User
Re: DATA INSUFF.. [#permalink] New post 02 Aug 2008, 09:33
durgesh79 wrote:
arjtryarjtry wrote:
It took the bus 4 hours to get from town A to town B. What was the average speed of the bus for the trip?

1.In the first 2 hours the bus covered 100 miles
2.The average speed of the bus for the first half of the distance was twice its speed for the second half


average speed = total distance / total time = d/4

so we have to find out d

statement 1 : we dont know the distance the bus covered in second two hours.. not suff
statement 2 : d/(2t1) = 2d/(2t2)
t2 = 2t1
we know t1+t2 = 4
so t1 = 4/3
and t2 = 8/3
still we cant find d ... so not suff

combine two statements

distance covered in 2 hours = distance covered in t1 (4/3) hours + distance covered in (2-4/3) hours
100 = d/2 + d/(2t2) * (2-4/3)
100 = d/2 + 3d/(2*8) * ((6-4)/3)
100 = d/2 + d/8

suff... actually no need to solve it. we know we can find d and the average speed.... Option C



i didnt get the simplification part.. kindly explain
Director
Director
avatar
Joined: 27 May 2008
Posts: 552
Followers: 5

Kudos [?]: 171 [0], given: 0

GMAT Tests User
Re: DATA INSUFF.. [#permalink] New post 02 Aug 2008, 09:49
arjtryarjtry wrote:
durgesh79 wrote:
arjtryarjtry wrote:
It took the bus 4 hours to get from town A to town B. What was the average speed of the bus for the trip?

1.In the first 2 hours the bus covered 100 miles
2.The average speed of the bus for the first half of the distance was twice its speed for the second half


average speed = total distance / total time = d/4

so we have to find out d

statement 1 : we dont know the distance the bus covered in second two hours.. not suff
statement 2 : d/(2t1) = 2d/(2t2)
t2 = 2t1
we know t1+t2 = 4
so t1 = 4/3
and t2 = 8/3
still we cant find d ... so not suff

combine two statements

distance covered in 2 hours = distance covered in t1 (4/3) hours + distance covered in (2-4/3) hours
100 = d/2 + d/(2t2) * (2-4/3)
100 = d/2 + 3d/(2*8) * ((6-4)/3)
100 = d/2 + d/8

suff... actually no need to solve it. we know we can find d and the average speed.... Option C



i didnt get the simplification part.. kindly explain


distance covered in first 2 hours = 100 (as per statement 1)
distance covered in first 4/3 hours = d/2 (as per statement 2)
distance covered in first (2-4/3) hours = average speed during this journey * time
= 3d / (2*8) * (2 - 4/3) ------> we know that for second half of the journey the time taken is 8/3 from statement 2
= d/8

so 100 = d/2 + d/8
Director
Director
avatar
Joined: 27 May 2008
Posts: 552
Followers: 5

Kudos [?]: 171 [0], given: 0

GMAT Tests User
Re: DATA INSUFF.. [#permalink] New post 05 Aug 2008, 01:08
EDIT : Just found this question in GMAT club tests.. and now i'd like to correct myself
the right answer is E
Re: DATA INSUFF..   [#permalink] 05 Aug 2008, 01:08
    Similar topics Author Replies Last post
Similar
Topics:
5 Experts publish their posts in the topic If it took a bus 4 hours to get from town A to town B, what AndreG 10 06 Oct 2010, 11:48
It took the bus 4 hours to get from town A to town B. What arjtryarjtry 12 07 Sep 2008, 22:43
It took the bus 4 hours to get from town A to town B. What sondenso 2 23 May 2008, 00:48
Mr. Jones drove from Town A to Town B in x hours. On the el1981 2 07 Apr 2008, 16:15
If a bus took 4 hours to get from town a to town b, what was ayl989 10 26 Apr 2007, 22:46
Display posts from previous: Sort by

It took the bus 4 hours to get from town A to town B. What

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.