Question

A tap fills a tank in 9 hours. Another tap empties the full tank in 12 hours. How long will it take to fill the tank, if both the taps are open? ​

Answer 1

Answer:

2 hours

Step-by-step explanation

A tap fills a tank in 4 hours.

Tap 1 hour work =

Another tap empties the full tank in 6 hours.

Tap 1 hour work =

Their together 1 hour work =

So, They together fill the tank in 12 hours

Hence if the tank is empty and both the taps are open then it will take 12 hours to fill tank

Answer 2

Answer:

36 hours needed to fill the tank