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  9. Q19

BPSC (Bihar PCS) 2019 · Question 19 of 148

One tap can fill a water tank in 3 hours and another tap can empty it in 4 hours. If the tank is one-third full and both the taps are opened together, then the time taken to fill the tank will be:

Miscellaneous

  1. A8 hoursCorrect
  2. B9 hours
  3. C10 hours
  4. D11 hours
  5. ENone of the above/More than one of the above

Answer: A. 8 hours

Explanation

The tank is 1/3 full, so 2/3 remains; net fill rate is 1/3 - 1/4 = 1/12 per hour, so time = (2/3)/(1/12) = 8 hours.

Source: Jagranjosh

← Q18View full paper (148 questions)Q20 →

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