A train 90 meters long completely crosses a 270-meter long bridge in 30 seconds. What is the speed of the train in km/h?
Choose the correct answer:
A) 34.2 km/h B) 37.2 km/h C) 40.2 km/h D) 43.2 km/h E) 46.2 km/h
speed = distance / time = (90 + 270)/30 = 360/30 (m/s) * 3600/1000 = 43.2 km/h   The answer is 43.2 km/h.
<result>D</result>
A train 90 meters long completely crosses a 270-meter long bridge in 30 seconds. What is the speed of the train in km/h?