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Tank B took 5h to fill tank. So in 1h it fills 1/5 of it.
Tank C took 3h to fill tank. So in 1h it fills 1/3 of it.
So if all 3 were turned on at the same time,fraction of the tank that's filled in 1h
= 1/6 + 1/5 + 1/3
= 5/30 + 6/30 + 10/30