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Tap A filled the tank in 4 hour

Every hour, tap A filled ¼ of the tank.

Likewise, tap B filled 1/5 of the tank every hour.

After one hour, (¼ + 1/5 ) = 27/60 of the tank was filled.

Every hour, tap C drained 1/3 of the tank.

The tank was draining (1/31/5 ) = 8/60 of the tank every hour

27/60 ÷ 8/60 = 27/8 = 3 3/8

The tank would be empty after 3 3/8 hour.

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Thanks a lot for the answer. Appreciated…

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