If $$t_1$$  is the time elapsed between 9:25 a.m to 2:50 p.m, and if $$t_2$$ is the time elapsed between 10:10 a.m to 5:15 p.m then $$t_1 : t_2 =$$

A

17 : 13

B

13 : 17

C

53 : 73

D

73 : 53