Question

Tap A can fill a tank in 8 hours and Tap B can empty the tank in 12 hours How long will it take to fill the empty tank if both of them are opened together

Answer 1

1/8-1/12
12-8/96
4/96
1/24
Reciprocal 24

So the answer is 24.


1 day needed to fill the empty tank when opened together.