Question

Four pipes can fill a tank in 70 minutes. How long will it take to fill the tank with 7 pipes?

Answer 1

Answer:

4 pipes -----> 70 mins

1 pipe ---------> x mins

x =70/4 mins

1 pipe -----> 70/4 mins

7 pipes ----> 70/4 *7 mins = 490/4 mins  = 122.5 mins

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Answer 2

Answer:

40 mins

Step-by-step explanation:

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   $\frac{70*4}{7}$

=40mins

Hence, the tank will be filled in 40 minutes.