Multiple choice

5 pipes are required to fill a tank in 1 hour 36 minutes. How long will it take if 2 pipes stopped working?

  1. 57.40 minutes

  2. 2 hours

  3. 48 minutes

  4. 2 hours 40 minutes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Work is proportional to the number of pipes. 5 pipes take 96 minutes. 3 pipes will take (5 * 96) / 3 = 160 minutes. 160 minutes is 2 hours and 40 minutes.

AI explanation

Using the formula for work, the total work required to fill the tank is the number of pipes multiplied by the time, giving 5 pipes times 96 minutes, which equals 480 pipe-minutes. When 2 pipes stop working, only 3 pipes remain active. Dividing the total work of 480 by 3 gives a new filling time of 160 minutes, which converts to 2 hours and 40 minutes.

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