A pool with a capacity of 18000 liters of water is filled through a narrow pipe in 6 hours and through

A pool with a capacity of 18000 liters of water is filled through a narrow pipe in 6 hours and through a wide pipe in 3 hours. How many hours will this pool be filled through two pipes?

First, let’s determine how many liters per hour the pool is filled through each of the pipes.

We divide the capacity of the pool by the rate of filling through each pipe.

We get:

18000/6 = 3000 liters per hour (through a narrow pipe).

18000/3 = 6000 liters per hour (through a wide pipe).

Through 2 pipes, the pool will be filled in 1 hour to:

3000 + 6000 = 9000 liters.

In this case, when two pipes work together, to fill the pool you will need:

18000/9000 = 2 hours.

Answer: Through 2 pipes, the pool will fill up in 2 hours.