Let the capacity of the tank be ‘150’ litres {LCM (25, 30)} Efficiency of pipe ‘A’ = (150/25) = 6 litres/minute Efficiency of pipe ‘B’ = (150/30) = 5 litres/minute Quantity of water filled by pipe ‘A’ in 18 minutes = 18 × 6 = 108 litres Quantity of water to be filled = 150 – 108 = 42 litres Time taken by pipe ‘A’ and ‘B’ together to fill 42 litres of water = {42/(6 – 1)} = 42 minutes Total time taken = 18 + 42 = 60 minutes
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I. L is six more than M.
II. N is four less than L.
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