The length of the bridge, which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds, is:
Question
The length of the bridge, which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds, is:
Solution
Sure, let's solve this step by step:
Step 1: Convert the speed from km/hr to m/s. We know that 1 km/hr = 5/18 m/s. So, 45 km/hr = 45 * (5/18) = 25 m/s.
Step 2: The train crosses the bridge in 30 seconds. So, the distance covered by the train in 30 seconds = speed * time = 25 m/s * 30 s = 750 meters.
Step 3: This distance is the sum of the length of the train and the length of the bridge. So, the length of the bridge = total distance - length of the train = 750 meters - 130 meters = 620 meters.
So, the length of the bridge is 620 meters.
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