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* A math problem, pls help to solve

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Jason.tuyj
 Post subject: * A math problem, pls help to solve
 Post Posted: Wed Jun 29, 2011 2:30 am 
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Posts: 36
A bicyclist travels uphill from town A to town B for 2 hours at an average speed of 4 miles per hour and returns along the same road at an average speed of 6 miles per hour. What is the bicyclist’s average speed for the round trip, in miles per hour?

(a) 24/5
(b) 5
(c) 26/5
(d) 27/5
(e) 28/5

A is correct.. why???
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RonPurewal
 Post subject: Re: A math problem, pls help to solve
 Post Posted: Wed Jun 29, 2011 7:16 am 
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ManhattanGMAT Staff


Posts: 7146
please read the forum rules: read-before-you-post-general-verbal-folder-guidelines-t2718.html

you can't post problems in this folder without giving the ORIGINAL SOURCE of the problem -- i.e., the company or author that first produced the problem (not, for instance, a forum or other secondhand source on which it has previously been posted).
if you don't know the original source, then i'm sorry, but you can't post the problem here.
this applies to MGMAT problems as well -- there are over three thousand problems in our database, so we won't recognize all of them from memory.

we will delete this thread within a week if the original source of the problem is not posted. thanks.
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