# math

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a helicopter blade spins 775 times in 3 minutes. find the rate of the revolutions per second.

• math -

divide 775 by 3

• math -

Enough, Jessica!!

The question asks for the revolutions per second, not per minute.

3 * 60 = 180 seconds in three minutes.

775/180 = ______ revolutions per second.

• math -

there are 180 seconds in3 minutes

so the number of revolutions/sec = 775/180
= appr 4.3 rotations/sec

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