A machine stamps 50 metal parts in 15 minutes. What is the unit rate in parts per hour?

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Answer 1 · 2018-04-22T21:28:35

#200# unit parts per hour.

#15# mins #= 50# metal parts
#30# mins #= 100# metal parts
#45# mins #= 150# metal parts
#60# mins #= 200# metal parts

Answer 2 · 2018-04-22T21:51:05

#50/0.25 = 200 # parts per hour.

The required units of a rate indicate which quantity needs to be divided by which quantity.

We want to know how many # " parts per hour"#

Therefore we need to divide the number of parts by the time in hours,

We have #50# parts in #15# mins which is the same as

#50# parts in #0.25# hours

#50/0.25 = 200 # parts per hour.