Question

12 pipes all of the same size fill a tank in 42 minutes. How long will it take to fill the if 21 pipes of the same size are used?

Answer 1

Answer:

21 pipes of the same size will take 24 minutes to fill the full or whole or entire tank or cistern.

Step-by-step explanation:

12 pipes can fill a tank in 42 minutes

1 pipe can fill a tank in 42×12 minutes

21 pipes can fill the tank in 42×12/21

= 2×12 = 24(answer).

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