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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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1 Answer

For this problem we need to do some unit conversion. Revolutions is found in both the given number and the converted number so we won't worry about it.

To convert, take the given number and multiply it by the conversion to convert from minutes to seconds.

900 revolutions         1 minute
------------------    *   ----------------- = 15 revolutions / second (the minutes unit cancels out)
    1 minute             60 seconds