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A pick up truck is fitted with new tires which have a diameter of 40 inches. How fast will the pick up truck be moving when the wheels are rotating at 395 revolutions per minute? Express the answer in miles per hour rounded to the nearest whole number. 

 Sep 6, 2016

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The circumference of the wheel is pi*40 inches, so the truck travels 395*pi*40 inches per minute.

 

This is 395*pi*40*60 inches per hour

 

This is 395*pi*40*60/(36*1760) miles per hour ≈ 47 miles per hour

.

 Sep 6, 2016

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