A pipe can empty a tank in 40 minutes. A second pipe with diameter twice as much as that of tbe first is also attached with the tank to empty it. The two together can empty the tank in :

A pipe can empty a tank in 40 minutes. A second pipe with diameter twice as much as that of tbe first is also attached with the tank to empty it. The two together can empty the tank in :
1). 8 minutes
2). 13 1/3 minutes
3). 30 minutes
4). 38 minutes

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