A tap can fill the tank in 15 minutes and another can empty it in 5 minutes. If the tank is already half -full and both the taps are opened together , how many minutes will the tank take to be emptied?

A tap can fill the tank in 15 minutes and another can empty it in 5 minutes. If the tank is already half -full and both the taps are opened together , how many minutes will the tank take to be emptied? Correct Answer 8

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