Multiple choice

One filling pipe P is three times faster than another filling pipe Q, if P can fill tank in 24 hours, then what is the time taken to completely fill the tank if both the pipes are opened together?

  1. 12

  2. 18

  3. 16

  4. 14

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

P fills in 24 hours, Q takes 3 times longer (72 hours). Combined rate: 1/24 + 1/72 = 4/72 = 1/18. Time = 18 hours. Option B correct. Option A (12) would be if rates were simply averaged. Option C (16) and D (14) are miscalculations.

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