A tank can be filled by tap A in 3 hrs and B can fill it in 4 hrs. Tap C can empty this filled tank in 6 hrs. If all three taps are opened simultaneously, how long will it take to fill the tank completely?

A tank can be filled by tap A in 3 hrs and B can fill it in 4 hrs. Tap

1.	A tank can be filled by tap A in 3 hrs and B can fill it in 4 hrs. Tap C can empty this filled tank in 6 hrs. If all three taps are opened simultaneously, how long will it take to fill the tank completely?
A.	8 hrs
B.	\(\frac{{10}}{7} hrs\)
C.	5 hrs
D.	\(\frac{{12}}{5} hrs\)
Answer» E.

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A tank can be filled by tap A in 3 hrs and B can fill it in 4 hrs. Tap C can empty this filled tank in 6 hrs. If all three taps are opened simultaneously, how long will it take to fill the tank completely?

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