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

Author Message
Intern
Joined: 03 Feb 2009
Posts: 27
Schools: Duke, UNC, Emory, Ga Tech, Vanderbilt, Indiana, Wash U, Texas, Rollins
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Kudos [?]: 19 [0], given: 0

How many hours did it take Helen to drive from her house to [#permalink]

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03 Feb 2009, 15:54
1
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Difficulty:

(N/A)

Question Stats:

100% (01:34) correct 0% (00:00) wrong based on 2 sessions

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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
Joined: 28 Dec 2004
Posts: 3363
Location: New York City
Schools: Wharton'11 HBS'12
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Kudos [?]: 297 [0], given: 2

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03 Feb 2009, 16:49
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, 16:49
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