SOLUTION: A motorboat can go 18 mph in still water. If a trip downstream takes 4 hours and return trip takes 5 hours, find the speed of the current.

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Question 263315: A motorboat can go 18 mph in still water. If a trip downstream takes 4 hours and return trip takes 5 hours, find the speed of the current.
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
(18+x)*4=5(18-x)
x=2
current is 2 mph
check
20*4=5*16
80=80
ok