SOLUTION: alvin paddled for 3 hours with a 6kmh current to reach a campsite. the return trip against the same current took 9 hours. find the speed of the boat in still water?

Question 718802: alvin paddled for 3 hours with a 6kmh current to reach a campsite. the return trip against the same current took 9 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 in mi/hr of the boat in still water
Let = the one-way distance he paddles in miles
Going with the current:
(1)
Going against the current:
(2)
-------------------
By substitution:
(2)
(2)
(2)
(2)
(2)
The speed of the boat in still water is 12 mi/hr
check answer:
(1)
(1)
(1)
and
(2)
(2)
(2)
OK

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