Q: The tap P can fill a cistern in 6 hours and tap Q can empty the full cistern in 10 hours. If both taps P and Q are kept open simultaneously, then in how many hours will the empty cistern be completely full?
A.
15 h
B.
18 h
C.
16 h
D.
12 h
Correct Answer:
Option B -
Explanations:
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