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# GMAT Plus Boat Word Problem

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Joined: 02 May 2004
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GMAT Plus Boat Word Problem [#permalink]  19 Jul 2006, 18:15
I found this question on the net
I believe it is a retired ETS Question
I have seen something similar before
Maybe I am misreading the question because it seems like a relatively easy rate problem, but I can't get the right answer
Any assistance would be appreciated..
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GMATPLUSBOATPROBLEM2.JPG [ 27.83 KiB | Viewed 462 times ]

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Joined: 30 Mar 2006
Posts: 1737
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D

Speed of water = 5
Speed of boat in still water = 15

Hence
Speed of boat upstream = 15 - 5 = 10
Speed of boat downstream = 15+5 = 20

Let distance be S
Time taken downstream = S/20
Time take upstream = S/10

Average speed = total distance/ total time
= S+S/ (S/20 +S/10)
= 2S/3S/20
= 40/3
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