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Two pipes a and b can fill a tank in 24 and 30 minutes respectively.both are opened together,but at the end of 8 minutes the first is turned off.the time taken ti fill the remaining part of the tank is.....if anyone know how to do it thn post it,

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Look together a n b would fill in 8 mins 8(1/24+1/30)=3/5th of the work d remaing 2/5th work can be filld by b =x(1/30)=2/5 =12 mins=x