How to solve world problem using time

Question

The mailroom's automatic folding machine can fold 7,500 pages per hour. How long will it take for the machine to fold a 6-page letter for a mass mailing to 625 individuals?

Answer 1

At 7500 pages per hour, a 6-page letter (just one) will take  6/7500 hours to fold.  

 

Each 6-page letter requires .0008 hours to fold.  We need to send 625 of these, so multiply by 625 and find that it takes

 

.0008 * 625 = 0.5 hours

 

0.5 hours is one-half an hour, or 30 minutes.

 

 

Final Answer:  30 minutes or 0.5 hours