Question

A swimming pool can be drained in 1 hour feeling it up takes 3 hours. if the swimming pool is full when all its inlet pipes and drains are opened simultaneously, how long will it take for the pool to be empty? ​

Answer 1

Answer:

Let's consider what happens in one hour.

If a pool fills in 3 hours, it means that after 1 hour it is

1

3

full.

If a pool empties in 6 hours, it means that in 1 hour it loses

1

6

So if it is filling and draining at the same time, after one hour the difference would be:

1

3

−

1

6

=

1

6

The nett result is that the pool fills at a rate of

1

6

per hour.

1

÷

1

6

=

6

hours to fill.

Step-by-step explanation:

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