SOLUTION: a motorboat took 2 hours to make a downstream trip witha 5 mph current. the return trip against the same current too 4 hours. find the speed of the boat in still water.

Question 414524: a motorboat took 2 hours to make a downstream trip witha 5 mph current. the return trip against the same current too 4 hours. find the speed of the boat in still water.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = the speed of the boat in still water in mi/hr
Let = the one-way trip in miles
Going downstream, speed = mi/hr
Going upstream, speed = mi/hr
given:
downstream:

upstream:

--------------
is the same in both equations

The speed of the boat in still water is 15 mi/hr
check:

upstream:

OK
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