A train 100 meters long completely crosses a 350-meter long bridge in 40 seconds. What is the speed of the train in km/h?	Choices:
A) 37.5 km/h
B) 40.5 km/h
C) 43.5 km/h
D) 46.5 km/h
E) 49.5 km/h
speed = distance / time = (100 + 350)/40 = 450/40 (m/s) * 3600/1000 = 40.5 km/h   The answer is 40.5 km/h.
<result>B</result>
A train 100 meters long completely crosses a 350-meter long bridge in 40 seconds. What is the speed of the train in km/h?