math
posted by ashley on .
a helicopter blade spins 775 times in 3 minutes. find the rate of the revolutions per second.

divide 775 by 3

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. 
there are 180 seconds in3 minutes
so the number of revolutions/sec = 775/180
= appr 4.3 rotations/sec