SOLUTION: a motor boat can travel 9 miles/h up a river, and back downstream at 15 miles/h. find the rate of the motorboat in still water and the rate of the water current?

Question 628752: a motor boat can travel 9 miles/h up a river, and back downstream at 15 miles/h. find the rate of the motorboat in still water and the rate of the water current?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = speed of boat in still water
Let = speed of water current
given:
(1)
(2)
---------------
Add the equations

and
(2)
(2)
(2)
The speed of the boat in still water is 12 mi/hr
The speed of the water current is 3 mi/hr
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