# math

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Assuming that a table saw blade has a diameter of 12 inches and spins at 3450 revolutions per minute (RPMs),determine how fast the tip of the teeth of the saw blade are traveling in miles per hour.

3450/12= 287.5 RPMs
287.5 min/60 mins = 1 hr
=4.8 RP/HR

• math -

Circumference = 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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