SOLUTION: A boat can go 20 miles against a current in the same time it can go 60 miles with the current. The speed of the current is 4 mph. Find the speed of the boat in still water.

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Question 460875: A boat can go 20 miles against a current in the same time it can go 60 miles with the current. The speed of the current is 4 mph. Find the speed of the boat in still water.
Answer by rwm(914) About Me  (Show Source):
You can put this solution on YOUR website!
t*(s-4)=20
60=t*(s+4)
t=5 s=8
check
5*(8-4)=20
5*(8+4)=60
5*12=60
ok