Question

A machine stamps 360 metal parts in 15 minutes. Find the unit rate in parts per hour

Answer 1

Just divide the number of parts made by the number of hours to get parts per hour.  15 minutes is 1/4 of an hour, so we divide 360 by 0.25 hours:

$(\frac{360\ parts}{0.25\ hours}) = 1440\ parts\ per\ hour$

Answer 2

15 minutes is 1/4 of an hour which is .25 hours
so all you got to do is divided the total number of metal parts divided .25 hours
360/.25=1440 metal parts in one hour