Question

One inlet pipe can fill an empty pool in 8 hours, and a drain can empty the pool in 16 hours. How long will it take the pipe to fill the pool if the drain is left open?

Answer 1

16 hours

Explanation:

1 inlet pipe can empty a pool in 8 hours

A drain can empty in 16 hours

Let y represent the time to fill up the pool of both outlets are left open

1/8 + (-1/16)= 1/y

1/8 - 1/16= 1/y

Collect The com

1/16= 1/y

y= 16 hours