A tap can fill a cistern in 40 minutes and a second tap can empty the filled cistern in 60 minutes. By mistake without closing the second tap. the first tap was opened. in how many minutes will the empty cistern be filled

A tap can fill a cistern in 40 minutes and a second tap can empty the filled cistern in 60 minutes. By mistake without closing the second tap. the first tap was opened. in how many minutes will the empty cistern be filled
1). 72
2). 84
3). 108
4). 120

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