A train 100 meters long completely crosses a 300 meters long bridge in 12 seconds. What is the speed of the train is?
Select the correct option: A) 32 kmph B) 76 kmph C) 120 kmph D) 43 kmph E) 40 kmph

Rationale: "s = ( 100 + 300 ) / 12 = 400 / 12 * 18 / 5 = 120 answer : c"
Answer: C