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

A pipe can empty a tank in 40 minutes. A second pipe with diameter twi

1.	A pipe can empty a tank in 40 minutes. A second pipe with diameter twice as much as that of the first is also attached with the tank to empty it . The two pipe together can empty the tank in:
A.	8 minutes
B.	13 minutes
C.	30 minutes
D.	38 minutes
Answer» B. 13 minutes

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

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