Question

a factory machine begins operating at 7:30 am and stops at 3:30 pm. the machine is shut down for maintenance from 11:00 am to 12:00 pm. when operating, the machine produces 18 parts per hour. how many parts does the machine produce during this time? a. 108 parts b. 117 parts c. 126 parts d. 144 parts

Explanation:

Step1: Calculate total time window

From 7:30 AM to 3:30 PM is 8 hours.

Step2: Subtract maintenance time

Maintenance is 1 hour (11:00 AM to 12:00 PM).
Operating time = $8 - 1 = 7$ hours

Step3: Calculate total parts produced

Parts = Operating time × Parts per hour
$\text{Total parts} = 7 \times 18$

Answer:

C. 126 parts