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

Question

Philoid · Accepted Answer

Number of hours Tap A requires to fill an empty tank : 8 hours

Number of hours Tap B requires to empty the full tank : 12 hours

Amount of water filled by Tap A in empty tank in one hour:

Amount of water Tap B empties in one hour:

Amount of water filled by Tap A and Tap B together in one hour: =

They can fill the tank together in 24 hours.