A manufacturing plant can machine parts at a rate of 7 parts every 3 minutes. If the plant continues to produce parts at this rate, how many machine parts will be produced in 3 1/2 hours?

A. 140 machine parts
B. 245 machine parts
C. 490 machine parts
D. 735 machine parts

Question

A manufacturing plant can machine parts at a rate of 7 parts every 3 minutes. If the plant continues to produce parts at this rate, how many machine parts will be produced in 3 1/2 hours?

A. 140 machine parts
B. 245 machine parts
C. 490 machine parts
D. 735 machine parts

anonymous · Answer

(x parts) / (y minutes) times (z hours) times (60 minutes) / (1 hour).  Here, x = 7, y = 3, and z = 3.5.  Just substitute and simplify.  Notice how the words "hour" and "minute" will cancel, giving just "parts"