The average of $$D_{1}$$ and $$D_{2}$$ is 40. The average of $$D_{2}$$ and $$D_{3}$$ is 45. The average of $$D_{1}$$ and $$D_{3}$$ is 55. What is the value of $$D_{3}$$ ?

A

45

B

55

C

50

D

60