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Time of A and B for filling the tank = (12×18)/12+18 =216/30=7hours 12minute. Total time (A+B+C) 48 minute more than (A+B)- A+B+C =8 hours ABA+B+CC 12188 72 649-1 Efficiency of leak =9-(6+4) = -1 Leak will empty the whole tank =72/1 =72min
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