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September 21, 2014

September 21, 2014

Posted by **Ed** on Sunday, May 13, 2012 at 4:04pm.

- math -
**MathMate**, Sunday, May 13, 2012 at 5:20pm55 mph= 55mph*5280 ft/mi * 12 in/ft /(60 min/h)

= 58080 in/min

Each revolution of the trailer tire travels a distance equal to the circumference of the tire

=(13)*π inches

Number of revolutions per minute

=58080/13π

=1422 rpm approx.

Note: the answer is the same if the car uses 16" tires. It's the speed of the trailer that counts.

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