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How many hours did it take Helen to drive from her house to

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Intern
Intern
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Joined: 03 Feb 2009
Posts: 27
Schools: Duke, UNC, Emory, Ga Tech, Vanderbilt, Indiana, Wash U, Texas, Rollins
Followers: 0

Kudos [?]: 2 [0], given: 0

How many hours did it take Helen to drive from her house to [#permalink] New post 03 Feb 2009, 14:54
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A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
How many hours did it take Helen to drive from her house to her parent's house?

1) Helen's average speed on this trip was 72 kilometers per hour
2) If Helen's average speed on this trip had been 8 kilometers per hour greater, it would have taken her one hour less
Current Student
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Joined: 28 Dec 2004
Posts: 3403
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 165 [0], given: 2

Re: DS: Rate Problem [#permalink] New post 03 Feb 2009, 15:49
i get C

D=R*t

1) D/T=72km/hr

2) D/(t-1)=80Km/r

together you can solve for T
Re: DS: Rate Problem   [#permalink] 03 Feb 2009, 15:49
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How many hours did it take Helen to drive from her house to

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