Question

pls help me to solve this question ​ ch 13 time a d work

Answer 1

Answer:

120 hrs

Step-by-step explanation:

Let 'x' be the number of hours in which C completes his work.

work done by A in one hour = 1/15

work done by B in one hour = 1/20

work done by C in one hour = 1/x

Work completed by by them together in one hour = 1/15 + 1/20 +1/x

we know that whole work is completed in 8hrs

Therefor

8 = 60x/60 + 7x

x = 120 hrs

Time taken by C to complete his work is  120 hrs

Hope this will be helpful to you .!!