Question

Barry can do a certain job in 9 hours, whereas it takes samuel 11 hours to do the same job. how long would it take them to do the job working together? 20/99 incorrect: your answer is incorrect. hr

Answer 1

To start, I think you have to find the average time. If that's the case, you add the two together and divide. 

9 + 11 = 20

20/2 = 10

It should take them together 10 hours.

Hope this helped.