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Thanks a lot!
The student gave the answer as 90 rpm. Could you please verify it? Also please explain how you derived that formula.
The pedal shafts on a bike are 8 inches long. The front gear has a diameter of 10 inches, the rear gear has a diameter of 5 inches. The wheels, including the tires, have a radius of 14 inches. How fast (in rpm) does the rider have to pedal in order for the bike to travel 15 miles per hour?
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