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# A boat travels from City A to City B upstream and returns

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A boat travels from City A to City B upstream and returns [#permalink]  13 Jan 2004, 18:14
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A boat travels from City A to City B upstream and returns back to City A downstream. If the average speed of the total journey is 48 mph and the speed of the stream is 10 mph, what is the upstream speed of the boat?
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40mph.

let the speed of the boat= x mph and given that speed of the stream= 10mph

Then upstream speed will be (x-10) and downstream will be (x+10) given that average speed = 48

the formula for average speed= 2ab/a+b
then 2*(x-10)(x+10)/x-10+x+10= 48 so x=50 but we are asked for upstream speed i.e x-10 so 50-10= 40 mph
Senior Manager
Joined: 30 Aug 2003
Posts: 330
Location: BACARDIVILLE
Followers: 1

Kudos [?]: 1 [0], given: 0

_________________

Pls include reasoning along with all answer posts.
****GMAT Loco****
Este examen me conduce jodiendo loco

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