At his usual rate a man rows 15 miles downstream in five hours less than it takes him…

PHYSICS · Subjective · AP · Physics 1: Algebra-based · Kinematics · Kinematics

Problem

At his usual rate a man rows 15 miles downstream in five hours less than it takes him to return. If he doubles his usual rate, the time downstream is only one hour less than the time upstream. What is the rate of the stream's current?

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