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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?

  • Trigonometry -

    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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