Question

A shredding machine can shred 20 sheets of paper in 14 seconds. The bin has room

for 1000 sheets of shredded paper.
How long will it take to fill the bin if the machine has to stop for 3 minutes after every
200 sheets to prevent overheating?

Answer 1

See below

Explanation:

Rate = 20 sheets / 14 seconds = 10/7 sheet / sec

every 200 sheets is 4 rest periods = 12 minutes

1000 sheets / (10/7 sheet/ sec) + 12 min

700 seconds + 12 minutes

= 700 seconds + 720 seconds = 1420 seconds = 23 min 40 sec