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Start learning 50% faster. Sign in nowLet total capacity of the tank is 315 litres (LCM of 45 and 35) Quantity of water filled by tap ‘A’ in one hour = 315/45 = 7 litres Quantity of water filled by tap ‘B’ in one hour = 315/35 = 9 litres Let tap ‘A’ is closed after ‘x’ hours So, 16 × x + 9 × (21 – x) = 315 Or, 7x = 126 Or, x = 18 hours