SOLUTION: Please I really need help on how to solve this word problem. Monica's motorboat took 5hr to make a trip downstream with a 6-mph current. The return trip against the same current t

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Question 809429: Please I really need help on how to solve this word problem.
Monica's motorboat took 5hr to make a trip downstream with a 6-mph current. The return trip against the same current took 8 hr. Find the speed of the boat in still water.
Answer by josgarithmetic(39625) About Me  (Show Source):
You can put this solution on YOUR website!
Let r = speed of boat in still water.
Let d = distance either direction.

Fundamental Rate*Time=Distance
Downstream, %28r%2B6%295=d
Upstream, %28r-6%298=d

The distance is the same for both directions.
%28r%2B6%295=%28r-6%298
Solve for r.