Question

4 pipes can fill a tank in 20hrs. how long will it take to fill the tank if 10 pipes of the same dimensions are used?​

Answer 1

Let 7 pipes take x minutes to fill the tank

In 70mins a tank is filled by 4pipes

In 1 mins a tank is filled by 70×4

In x mins a tank will be filled by

7

70×4

=40mins

Hence, the tank will be filled in 40 minutes.