Multiple choice

Two filling pipes A and B together can fill a tank with rate of 40 lit/min and 60 lit/min respectively in 8 min. If a waste pipe can empty the filled tank in 32 min. then what is the rate of waste pipe (in lit/min)

  1. (a) 30 lit/min.

  2. (b) 25 lit/min.

  3. (c) 20 lit/min.

  4. (d) 16 lit/min.

  5. (e) 24 lit/min.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Combined rate of filling = 40 + 60 = 100 lit/min. In 8 min, they fill 800 liters. If a waste pipe empties it in 32 min, its rate is 800 / 32 = 25 lit/min.

AI explanation

The combined rate of pipes A and B is 40 + 60 = 100 liters per minute, making the total tank capacity 100 * 8 = 800 liters. The waste pipe empties this 800-liter tank in 32 minutes. Using the formula for emptying rate, the rate is 800 / 32 = 25 liters per minute. The rate of the waste pipe is 25 liters per minute.

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