It takes 15 minutes to fill an oil tank. However the oil tank is being emptied through an exhaust pipe, which can empty it in 30 minutes. If this exhaust pipe remains open, how long will it take to fill this tank completely?A. 20 minutesB. 25 minutesC. 30 minutesD. 40 minutes

It takes 15 minutes to fill an oil tank. However the oil tank is being

1.	It takes 15 minutes to fill an oil tank. However the oil tank is being emptied through an exhaust pipe, which can empty it in 30 minutes. If this exhaust pipe remains open, how long will it take to fill this tank completely?A. 20 minutesB. 25 minutesC. 30 minutesD. 40 minutes
A.	B
B.	D
C.	A
D.	C
Answer» E.

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It takes 15 minutes to fill an oil tank. However the oil tank is being emptied through an exhaust pipe, which can empty it in 30 minutes. If this exhaust pipe remains open, how long will it take to fill this tank completely?A. 20 minutesB. 25 minutesC. 30 minutesD. 40 minutes

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