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Let total capacity of the tank is 240 litres (LCM of 48 and 30) Quantity of water filled by tap ‘A’ in one hour = 240/48 = 5 litres Quantity of water filled by tap ‘B’ in one hour = 240/30 = 8 litres Let tap ‘A’ is closed after ‘x’ hours So, 13 × x + 8 × (20 – x) = 240 Or, 5x = 80 Or, x = 16 hours
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