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

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Senior Manager
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A boat travels from City A to City B upstream and returns [#permalink]

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13 Jan 2004, 16:49
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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****
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13 Jan 2004, 16:57
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
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Location: BACARDIVILLE
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Kudos [?]: 18 [0], given: 0

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13 Jan 2004, 17:00
Very Good!
I did not think to plug a figure in as the total miles. I solved it traditionally.

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

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13 Jan 2004, 18:59
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
13 Jan 2004, 18:59
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