Question 22
A large pool uses 5 taps to fill it up with water. If the 1st to 4th taps are turned on, it will take 6 hours to fill up the pool completely with water. If the 2nd to 5th taps are turned on, it will take 8 hours. If the 1st and 5th taps are turned on, it will take 12 hours. How many hours will it take the 5th tap alone to fill up the pool completely with water?