Trigonometry

posted by Laura

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. Steve

    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

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