A person sees a train passing over 4 km long bridge. The length of the train is half that of bridge if the train clears the bridge in 4 mins. What is the speed of the train?
Distance covered in 4/60 hours = (4 + 4/2) = 6 km Distance covered in 1 hour = 6 x (60/4) = 90 km/hr So, speed of the train = 90 km/hr
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