Question

Three pipes A, B and C can fill a cistern in 6 hours. after working at it together for 2 hours. C is closed and A and B fill it in 7 hours more. How many hours will C alone take to fill the cistern?​

Answer 1

Answer:

18h

Step-by-step explanation:

A+B+C all are work completed 6h

A+B+C one day work = 1/6. ......... (1)

so A+B are are remaining work 7h more than

total work A+ B = 7 +2 = 9 .....(2)

1day work = 1/9

equetion 1 - 2

1/6 - 1/9 = 18