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Distance speed

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Senior Manager
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Kudos [?]: 55 [0], given: 193

Distance speed [#permalink] New post 29 May 2011, 21:48
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Difficulty:

  5% (low)

Question Stats:

86% (02:48) correct 14% (00:54) wrong based on 7 sessions
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?

6.75
7
7.25
7.5
7.75
[Reveal] Spoiler: OA

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Senior Manager
Senior Manager
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Joined: 24 Mar 2011
Posts: 469
Location: Texas
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Kudos [?]: 52 [1] , given: 20

Re: Distance speed [#permalink] New post 29 May 2011, 22:08
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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: Distance speed   [#permalink] 29 May 2011, 22:08
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