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A car engine turns 900 revolutions per minute while idling. How many revolutions does a car engine turn in one second while idling?

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2 Answers

This is a unit conversion problem
900 rev/min *1min/60sec
which is 15 rev/sec
If it turns 900 times each minute and there are 60 seconds in a minute then it turns 900/60 times each second 900/60=15 revolutions per second.
 
(900 revolutions/minute)/(60 seconds/minute)=15 revolutions per second.