Pipe a and b fill a tank in 24hrs.if they both work for8hrs and then pipe b closed and pipe a filled the tank in 28hrs
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( A + b ) can fill an empty tank in 8 hours and after 2 hours B was stopped. That means first 2 hours A and B worked together. ( A + b ) can fill a 2/8 = 1/4 part in 2 hours. It means A can fill ( 3/4 × 1/9 ) = 1/12 part in 1 hour.
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