SOLUTION: In still water, a boat averages 18 mile per hour. It takes the same amount of time to travel 33 miles downstream, with the current, as 21 miles upstream, against the current. What

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Question 1135736: In still water, a boat averages 18 mile per hour. It takes the same amount of time to travel 33 miles downstream, with the current, as 21 miles upstream, against the current. What is the rate of the waters’s current?
Answer by josgarithmetic(39623) About Me  (Show Source):
You can put this solution on YOUR website!
c, speed of river current

%2818%2Bc%29%2F33=%2818-c%29%2F21
Solve for c.