a machine stamps 360 metal parts in 15 minutes. Find the unit rate in parts per hour
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:
\((\frac{360\ parts}{0.25\ hours}) = 1440\ parts\ per\ hour\)
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