Multiple choice

There is an inlet pipe at the top of a tank and an outlet pipe exactly in the middle of the tank. If both the taps are opened simultaneously, the tank is filled in 36 hours. If the inlet pipe alone can fill the tank in 30 hours and the outlet pipe is at the bottom of the tank, then how much time does it take to fill the tank? (Assume that there is no difference in the flow rate of water through the outlet pipe due to a change in its location)

  1. 36 hours

  2. 40 hours

  3. 42 hours

  4. 45 hours

  5. 48 hours
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let the total capacity be V. Inlet fills at V/30. With outlet at middle, it drains half the tank. The problem setup implies a rate calculation where the net flow leads to 42 hours.

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