SOLUTION: A speedboat takes 4 hours longer to go 80 miles up a river than to return. If the boat cruises at 15 miles per hour in still water, what is the rate of the current?

Question 387782: A speedboat takes 4 hours longer to go 80 miles up a river than to return. If the boat cruises at 15 miles per hour in still water, what is the rate of the current?
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Rate*Time=Distance

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Let the current speed be C.
With the current,

Against the current,

Subsituting,

Use the common denominator,

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Only one solution since
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mph

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