Question

14 pipes are required to fill a tank in 40 minutes how long will it take if only 7 pipes are used?

Answer 1

Answer:

it will take 20 minutes...

Answer 2

Answer:

Let the desired time to fill the tank be x minutes.

In 40 mins a tank is filled by 14 pipes

Lesser the number of pipes more will be the time required by it to fill the tank.

So, this is a case of inverse proportion.

Hence, 40×7=x×14

⇒280/14=x

⇒x=20

Thus, the time is taken to fill the tank by 7 pipes is 20 minutes.

Step-by-step explanation:

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