A black pipe can empty a tank in 8 hours, while a red pipe can fill it in 3 hours. If the tank is initially half-filled and the red pipe is opened in it, how many black pipes are required in total to be opened in it to empty the tank in 12 hours?

A black pipe can empty a tank in 8 hours, while a red pipe can fill it

1.	A black pipe can empty a tank in 8 hours, while a red pipe can fill it in 3 hours. If the tank is initially half-filled and the red pipe is opened in it, how many black pipes are required in total to be opened in it to empty the tank in 12 hours?
A.	2
B.	3
C.	4
D.	5
E.	6
Answer» C. 4

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A black pipe can empty a tank in 8 hours, while a red pipe can fill it in 3 hours. If the tank is initially half-filled and the red pipe is opened in it, how many black pipes are required in total to be opened in it to empty the tank in 12 hours?

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