SOLUTION: A boat goes 540 miles downstream in the same time it can go 450 miles upstream. The speed of the current is 4 miles per hour. Find the speed of the boat in still water.

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Question 237085: A boat goes 540 miles downstream in the same time it can go 450 miles upstream. The speed of the current is 4 miles per hour. 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!


Let represent the speed of the boat in still water.

Downstream trip:



Upstream trip:



So



Cross-multiply:








John