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

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Senior Manager
Joined: 30 Aug 2003
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A boat travels from City A to City B upstream and returns [#permalink]  13 Jan 2004, 16:49
A boat travels from City A to City B upstream and returns from City B to City A downstream. If the speed of the boat in still water is 40 mph and the speed of the stream is 20 mph, what is the average speed of the journey?

a. 30 mph
b. 32 mph
c. 40 mph
d. 47 mph
3. 60 mph
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Pls include reasoning along with all answer posts.
****GMAT Loco****
Este examen me conduce jodiendo loco

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Joined: 28 Oct 2003
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Plug. Say the trip was 240 miles each way.

Upstream, 240 miles at 20 mph, 12 hours.
Downstream 240 miles at 60 mph, 4 hours.

16 hours, 480 miles.

480/16= 30 mph
Senior Manager
Joined: 30 Aug 2003
Posts: 330
Location: BACARDIVILLE
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Very Good!
I did not think to plug a figure in as the total miles. I solved it traditionally.

Jolly good then
_________________

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

Manager
Joined: 26 Dec 2003
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I got 30 too. given that boat speed=40, speed of the stream=20 then using formula for average speed which is 2ab/a+b upstream will be 40-20 ie 20 mph and downstream will be 40+20 ie 60 mph then using the above formula 2*60*20/60+20= 30 mph
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