A train 130 meters long completely crosses a 320-meter long bridge in 30 seconds. What is the speed of the train in km/h?
Select:
A) 42 km/h  B) 46 km/h  C) 50 km/h  D) 54 km/h  E) 58 km/h
speed = distance / time = (130 + 320)/30 = 450/30 (m/s) * 3600/1000 = 54 km/h   The answer is 54 km/h.
<result>D</result>
A train 130 meters long completely crosses a 320-meter long bridge in 30 seconds. What is the speed of the train in km/h?