Posted by Meshelle on Tuesday, March 3, 2009 at 7:56pm.
The downstream speed with respect to land is V+6 and the upstream speed is V-6, where V is the speed in still water.
Let the distance be D
D/(V+6) = 4 hrs
D/(V-6) = 5
4(V+6) = 5(V-6)
V = 54 mph
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