1.

Four pipe A, B, C and D can fill a cistern in 20, 25, 40 and 50 hours respectively. If A and B are opened as inlet pipe into the cistern and C and D are opened as outlet pipes from the cistern and all the four pipes are opened simultaneously, how many hours will it take to fill the cistern completely?

Answer»

a. 20 HOURS
b)11 hours
C)22 hours
d)45 hours

Answer :C


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