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July 25, 2014

July 25, 2014

Posted by **emma** on Saturday, May 4, 2013 at 6:13pm.

Answer:

3450/12= 287.5 RPMs

287.5 min/60 mins = 1 hr

=4.8 RP/HR

- math -
**PsyDAG**, Sunday, May 5, 2013 at 1:15pmCircumference = πd = 3.14 * 12 = 37.68 inches for tip to travel one revolution

one mile = 63,360 inches

The question is not how many revolutions but how fast the tips of the teeth are going.

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