Homework Help: Math

Posted by Sarah on Sunday, March 25, 2012 at 2:19pm.

JJ's boat will go 15 mph in still water. If he can go 12 mph downstream in the same amount of time it takes to go 9 mph upstream, what is the speed of the current?

Math - Henry, Monday, March 26, 2012 at 11:41pm
Vb + Vc = 12.
Vb - Vc = 9.
Add the Eqs:
2Vb = 21.
Vb = 10.5 MPH.
Vc = 1.5 mph.

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