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ATQ,
Let the capacity of the tank be 50 litres {LCM (10, 25, and 50)}
Efficiency of pipe ‘P’ = (50/10) = 5 litres/minute
Efficiency of pipe ‘Q’ = (50/25) = 2 litres/minute
Efficiency of pipe ‘R’ = (50/50) = 1 litre/minute
Required time = {50 / (5 + 2 – 1)} = 50/6 = 25/3
The tank will be filled in 25/3 min or 8 minutes and 20 seconds.
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