Question

Amy can get a job done alone in 12 hours; Tom can get the same job done in 15 hours alone. How long will it take if both Amy and Tom work together to get the job done?

Answer 1

13.5 hours

Explanation:

If it takes Amy 12 hours to complete the job alone

And it takes Tom 15 hours to complete the same job alone,

How long will it take for both of them to get the job done together?

Amy= 12 hours

Tom= 15 hours

Amy + John =?

(12 + 15)/ 2

27/2= 13.5 hours.

So it would take Amy and Tom 13.5 hours to complete the job together.