Question

the disk in the hard drive of Stella's computer makes 90 full turns every second. How many minutes will it take for the disk to make 135 000 full turns?

Answer 1

First we have to divide 135,000 by 90, which equals 1,500.  Then we divide 1,500 (seconds) by 60 (60 seconds in a minute) and get: 25 Minutes.