5. How much time will a train, 180 m long, take to cross a bridge, 220 m long, if it is running at a speed of 72 km/hr?
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The front of the train must travel the length of the bridge plus its own length for the end of the train to clear the bridge.
Distance the front travels = 132 + 110 m = 242 m
72 km/h = 72,000 m/h = 72,000m/3600s = 20 m/s
speed = distance / time, so time = distance / speed
time = 242 m/20 m/s = 12.1 s
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