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SOLVE MATH WORD PROBLEM PLEASE WITH STEP BY STEP ANSWERS

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A TIRE FOR A COMPACT CAR IS 21 INCHES IN DIAMETER. IF THE CAR IS TRAVELING AT A SPEED OF 80 MILES/HOURS, FIND THE NUMBER OF REVOLUTIONS THE TIRE MAKES PER MINUTE.

Oct 17th, 2017

diameter is 21 inches

circumference of tire is = pi*d

                                    = 22/7 *21

                                   = 66 in

                                                                      car speed is 80 miles/hr = 2145.792 m/m       [ 1 mile/hr=26.8224 meters/minute]

                                                                66 inches = 1.6764 meters/rev                           [ 1 inches = 0.0254 meters]

rev= 2145.792 / 1.6764

     = 1,280 rev / minute


Sep 14th, 2014

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