A tank is by pipe A in 5 hours, pipe B in 10 hours and pipe C 30 hours. How much time will all the pipes together take to fill the tank?

A tank is by pipe A in 5 hours, pipe B in 10 hours and pipe C 30 hours

1.	A tank is by pipe A in 5 hours, pipe B in 10 hours and pipe C 30 hours. How much time will all the pipes together take to fill the tank?
A.	2.5 hours
B.	2 hours
C.	3.5 hours
D.	3 hours
Answer» E.

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A tank is by pipe A in 5 hours, pipe B in 10 hours and pipe C 30 hours. How much time will all the pipes together take to fill the tank?

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