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Q:

Four pipes P, Q, R and S can fill a cistern in 25, 20, 50 and 40 hours respectively. The pipe Q was opened at 7 pm, P at 9 pm, S at 10 pm and R at 11 pm. When will the cistern be full?

  • 1
    3 : 29 AM
  • 2
    2 : 47 AM
  • 3
    4 : 09 AM
  • 4
    5 : 02 AM
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Answer : 3. "4 : 09 AM"

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