SOLUTION: Mia's boat took 3 hr to make a trip downstream with a 6 mph current. The return trip against the same current took 5 hr. Find the speed of the boat in still water.

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Question 183393: Mia's boat took 3 hr to make a trip downstream with a 6 mph current. The return trip against the same current took 5 hr. Find the speed of the boat in still water.
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


Distance equals rate times time.



When the boat is going downstream, the current adds to the boat's speed, when going upstream the current subtracts.

Upstream trip:



Downstream trip:



Since the distance was the same going either way,



Solve for r.



John