Capgemini Company Numerical Ability Pipes and Cistern

Three pipes A,B and C are attached to a tank.A and B can fill it in 20 and 30 minutes respectively while C can empty it in 15 minutes.If A,B and C are kept open successively for 1 minute each, how soon will the tank be filled?

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Capgemini Other Question

log2x-5logx+6=0 If log2x-5logxx+6=0,then what would the value /values of x be?