A slow printer can print 100 fliers in 30 minutes. A fast printer can print 100 fliers in 20 minutes. How long will it take to print 100 fliers if both printers are going at the same time?

Question

A slow printer can print 100 fliers in 30 minutes. A fast printer can print 100

fliers in 20 minutes. How long will it take to print 100 fliers if both printers are

going at the same time?

Help

Answer 1

slow printer pints 3.33 fliers in one minute

fast printer prints 5 fliers in one minute

together they print 8.33 flies in one minute

together they will take 100/8.33 = 12 minutes to print 100 fliers.