Correct option is C
Given:
Train length = 266 m
Tunnel length = 559 m
Time = 66 sec
Formula Used:
Speed =
Total Distance = Train length + Tunnel length
Conversion: 1 m/s = 18/5 kmph
Solution:
Total Distance = 266 + 559 = 825 m.
Speed in m/s = 825 / 66 = 12.5 m/s.
Speed in kmph = = 45 kmph
So the correct answer is (c)