Total time taken?

Question

A multiple photostat copier can create 120 copies in 30 sec. How much time would it take to form 2000 copies on two such machines working simultaneously. Explain with steps.

Answer 1

A single machine which takes 30 sec to make 120 copies will take 500 sec to make 2000 copies.

So if two machines worked simultaneously it would take half the time which is 250 seconds.

Answer 2

First divide number of copies by number of seconds. You'll have number of copies each second: 120/30=4
Then divide 2000 copies by 4 (number of copies in each second)=500
Then divide 500 by number of machines 2 = 500/2=250
It will take 250 seconds= 2 minutes and 10 seconds.
Of course, anyone who has worked with photocopy machines knows that they NEVER run smoothly, so as a math problem that answer is correct, in real life it will take a LOT longer.

Answer 3

Time taken to make 120 copies = 30Seconds
Time taken to make 1 copy = 30/120=0.25 seconds
Time taken to make 2000 copies = 0.25*2000 = 500

As two machines are working simultaneously, so their speed will also be equal. Therefore,
Total time taken = 500/2 = 250 seconds or 2minutes 10seconds

Answer 4

ONLY 2 MIN