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Tap A alone can fill the tank in = 12 hours. Tap B alone can fill the tank in = (5/1) × 3 = 15 hours Tap C alone can empty the tank in = x hours (A + B +C) together can fill the tank in = 5 × (8/5) = 8 Taking LCM of 12, 15 and 8 =120 Efficiency of Tap A = 10 Efficiency of Tap B = 8 Efficiency of Taps (A + B +C) = 15 Efficiency of Taps (A +C) = 15 – 8 = 7 Tap A and C together take to fill 35% part of the tank in, => (35/100) × (120/7) = 6 hours
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