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Start learning 50% faster. Sign in nowWork done by the filling pipe in 1 minute = 1/18 Work done by the emptying pipe in 1 minute = -1/27 Net work done in 1 minute = (1/18 - 1/27) = 1/54 Time taken to fill the tank = 1 ÷ 1/54 = 54 minutes. Correct answer: a) 54 minutes
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