Q: Each inlet pipe can fill an empty cistern in the 84 hours while each outlet pipe can empty the same cistern from a filled condition in 105 hours. When the cistern is empty , 9 inlet pipes and 10 outlet pipes are simultaneously opened . After how many hours will the cistern be completely filled?
A.
90
B.
88
C.
80
D.
84
Correct Answer:
Option D -
Explanations:
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