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It takes a printer 6 hours to print the class schedules for all of the students in a college. A faster printer can do the job in 4 hours.
How long in hr) will it take to do the job if both printers are used?

Respuesta :

The number of hours that it'll take both printers to do the job is 2.4 hours.

Number of hours used by printer A = 6 hours

Number of hours used by printer B = 4 hours

Therefore, the number of hours that'll be used by both printers will be calculated thus:

1/6x + 1/4x = 1

Using 12 as the LCM

2x + 3x = 12

5x = 12

Divide both side by 5

5x/5 = 12/5

x = 2.4 hours

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