Tap A takes 8 minutes to fill an empty fish tank of dimension 40 cm width by 120 cm length and unknown height with water to the brim .
Tap B takes 6 minutes to fill the same empty fish tank with water to the brim .
Tap C takes 4 minutes to drain all the water out from the full fish tank .
How long does it take for the water to overflow from the fish tank , given that the fish tank is half-filled and all 3 taps are turned on at the same time ?
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