search
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 -
answer image

Explanations:

explanation image