Question

17) Pipe A can fill a tank in 3 hours. Pipe B can fill it
in 4 hours. An outlet pipe C can empty the full
tank in 6 hours. If all three pipes are kept open
simultaneously, in how many hours will the tank
be half full?​

Answer 1

in 45 min the tank will be empty

Answer 2

Answer:

3:4:-6

efficiency

4:3:-2

work is 12

total work in one hour is 4+3-2=5

12/5

2.4 hours