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# M03 Q 36

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Manager
Joined: 02 May 2012
Posts: 109
Location: United Kingdom
WE: Account Management (Other)

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18 Sep 2012, 08:54
If I understand the concerns of people who dislike the question, they are saying that when the swimmer swims up and down the river we can't be sure that he / she is experience any current. In otherwords, current could be 0. I think it's reasonable to assume in any exam (GMAT or otherwise) that any river has a current all the time. Therefore is current>0, and x>y.

Try picking numbers:

Speed of swimmer = 2km/hr
Speed of current = 1 km/hr

Distance of swim = 2 km
Up / down round trip:
Time up =d/v = (0.5 x 2)/(2-1) = 1/1 = 1

Time down = (0.5 x 2)/(2+1) = 1/3
Total time (x)= 1.33
Still water trip
Time (y)= 2/2 = 1
1.33>1 so x>y

Cool?
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In the study cave!

Re: M03 Q 36   [#permalink] 18 Sep 2012, 08:54

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# M03 Q 36

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