Three trains A, B and C moving with respective speeds $$S_{1} S_{2}$$ and $$S_{3}$$ kmph take $$t_{1}, t_{2}$$ and $$t_{3}$$ hours respectively to cover a distance of $$x$$ km. If $$S_{1} : S_{2} : S_{3} = 3 : 4 : 5$$ , then $$t_{1} : t_{2} : t_{3}$$ =

A

5 : 4 : 3

B

20 : 15 : 12

C

16 : 15 : 9

D

15 : 9 : 12