Question

One tap fills a tank in 3 hours and the other in 4 hours. The outlet can empty the tank
in 2 hours. In what time will the tank be filled if both the taps are turned on and the
outlet has been left open accidentally?​

Answer 1

Anwer:

Tap A fills a tank in 3 hours

Tap A's 1 hour work =  

Tap B can empty the tank in 4 hours

Tap B's 1 hour work =  

Tap (A+B)'s 1 hour work =  

So, the tank will be full in 12 hours

C can empty the tank in 6 hours .

C's 1 hour work =  

Tap (A+B+C)'s 1 hour work =  

So, it will take 12 hours to be emptied

Answer 2

Answer:

12 hours to fill the tank

Step-by-step explanation:

1/3 + 1/4 - 1/2 = 1/3 - 1/4 = 1/12

12 hours