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Noelle walks from point A to point B at an average speed of 5 kilomete

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Senior Manager
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Noelle walks from point A to point B at an average speed of 5 kilomete [#permalink]

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New post 29 May 2011, 22:48
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A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

90% (02:12) correct 10% (00:54) wrong based on 10 sessions

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Noelle walks from point A to point B at an average speed of 5 kilometers per hour. At what speed, in kilometers per hour, must Noelle walk from point B to point A so that her average speed for the entire trip is 6 kilometers per hour?

A. 6.75
B. 7
C. 7.25
D. 7.5
E. 7.75
[Reveal] Spoiler: OA

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Senior Manager
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Re: Noelle walks from point A to point B at an average speed of 5 kilomete [#permalink]

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New post 29 May 2011, 23:08
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let x be the distance
total dist / total time = avg speed
(x+x)/(t1+t2) = 6
t1 = x/5
t2 = x/s
putting the values,
2x/ (x/5 + x/s) = 6
10s = 6s +30
s = 7.5
Re: Noelle walks from point A to point B at an average speed of 5 kilomete   [#permalink] 29 May 2011, 23:08
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Noelle walks from point A to point B at an average speed of 5 kilomete

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