Question

Q10. A city water supply tank has two inlet pipes X and Y, which can fill it in 20 and 30 hours
respectively, and an outlet pipe Z which can empty a full tank in 40 hours. If the tank is empty
and the taps are opened in succession for one hour each, and the process continues, in how
many hours will the tank get filled?
A. 49 1/4
B. 51 3/7
C. 49%
D. 49 1/7​

Answer 1

Answer:

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