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ATQ,
Let the total capacity of the cistern be 75 litres {LCM (15 and 25)}
Efficiency of pipe ‘X’ = (75 / 15) = 5 litres/hour
Efficiency of pipe ‘Y’ = (75 / 25) = 3 litres/hour
Water filled in 5 hours by both pipes = 5 × (5 – 3) = 10 litres
Time taken by pipe ‘X’ to fill remaining cistern = (75 – 10) / 5 = 13 hours
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