A tank can be filled by one pipe in four hours and by a second pipe in six hours; and when it is full, the tank can be drained by a third pipe in three hours. If the tank is empty and all three pipes are open, in how many hours will the tank be filled?

A8 hours
B12 hours
C24 hours

Verified Answer :

i think its a because the question says one pipe fills it in 4 hrs, then 2 pipes in 6 hrs, so 3 pipes in 8 hrs?!!?
is this ok?

Answer:

I think maybe b

Step-by-step explanation:

i might be wrong though message and i'll delete