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ATQ, We can say that time taken by pipe ‘Y’ to fill the tank = ‘h’ hours Then, capacity of tank = 2.4h units Therefore, Efficiency of pipe ‘X’ = 2.4h/15 = 0.16h units/hr Efficiency of pipes (X + Y) = 2.4h/25 = 0.096h units/hour Therefore, efficiency of pipe ‘Y’ = -0.096h – (-0.16h) = 0.064h units/hour So, 0.064h = 2.4 h = 37.5 Total capacity of the tank = 37.5 × 2.4 = 90 litres
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