Pipe C can fill a tank in 12 hours and pipe D can fill the same tank in 40 hours. In how many hours both pipe C and D together can fill the same tank?

Pipe C can fill a tank in 12 hours and pipe D can fill the same tank i

1.	Pipe C can fill a tank in 12 hours and pipe D can fill the same tank in 40 hours. In how many hours both pipe C and D together can fill the same tank?
A.	\(\frac{{60}}{7}\;hours\)
B.	\(\frac{{60}}{{11}}\;hours\)
C.	\(\frac{{120}}{{13}}\;hours\)
D.	\(\frac{{120}}{{11}}\;hours\)
Answer» D. \(\frac{{120}}{{11}}\;hours\)

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Pipe C can fill a tank in 12 hours and pipe D can fill the same tank in 40 hours. In how many hours both pipe C and D together can fill the same tank?

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