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Intern
Intern
Joined: 11 Aug 2009
Posts: 3
Followers: 0

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

Thank you in advance for your assistance [#permalink] New post 11 Aug 2009, 10:35
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

100% (02:50) correct 0% (00:00) wrong based on 1 sessions
Thank you in advance for your assistance.
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Rate problem.jpg
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Senior Manager
Senior Manager
User avatar
Joined: 20 Mar 2008
Posts: 457
Followers: 1

Kudos [?]: 54 [0], given: 5

GMAT Tests User
Re: Rate problem [#permalink] New post 11 Aug 2009, 10:58
A for me.

# hrs required for driving the first x miles = x/50.

St. 1: # hrs required for driving the remaining distance = (530 - x)/60.

Now, (530 - x)/60 + x/50 = 10. We can solve for x, and find x/50. Sufficient.

St. 2: 4 hrs more than how many, 1hr? 2 hr? 3hr? . No way to determine the time taken for driving the remaining distance. Insufficient.
Manager
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GMAT Tests User
Re: Rate problem [#permalink] New post 11 Aug 2009, 12:16
1)
Given distance = 530 and total time = 10 hours
Time taken for driving x miles = x/50
Time taken for driving remaining distance = (530 - x)/60
So total time taken = x/50 + (530 -x)/60 = 10
x = 350
2) Let d be the total distance and x be the distance he drove at speed of 50.
x/50 - (d-x)/60 = 4
So 2 alone is not sufficient but 1 alone is sufficient.
So answer is 1
Re: Rate problem   [#permalink] 11 Aug 2009, 12:16
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