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ATQ,
Let capacity = 480 litres (LCM of 48, 80, 96)
Efficiency of A = 480 ÷ 48 = 10 litres/minute
Efficiency of B = 480 ÷ 80 = 6 litres/minute
Efficiency of C = 480 ÷ 96 = -5 litres/minute
Filled in 30 minutes = (10 - 5) × 30 = 150 litres
Remaining = 480 - 150 = 330 litres
Time = 330 ÷ (10 + 6 - 5) = 330 ÷ 11 = 30 minutes
Total time = 30 + 30 = 60 minutes
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