The length of the bridge, which a train 155 metres long and travelling at 45 km/hr can cross in 30 seconds, is: Select.
A) 220 m
B) 225 m
C) 245 m
D) 250 m
E) 270 m

Rationale: "let the length of the bridge : l the equation now is l + 155 / 12.5 m / s ( 45 km / hr or 12.5 m / s ) = 30 solving , l = 220 m answer : a"
Answer: A