# Trigonometry

A water wheel has a radius of 15 ft. A river passing through the water wheel turns the wheel at 11 revolutions per minute(rpm). What is the speed of the river in miles per hour?

1. what's the circumference of the wheel? 30pi

So, 30pi ft flows by 11 times per minute

That makes a river speed of 30pi*11 ft/min

Now convert that to mi/hr

posted by Steve

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