Question

12 pipes all of the same size fill a tank in 42 mins how long will it take to fill the same tank if 21 pipes of the same size r used.

Answer 1

Answer:

Since 12 pipes fill the tank in 42 minutes.

So, 21 pipes will do that in x minutes.

12×42=21×x

⇒

21

12×42

=x

=24 minutes.