The length of the bridge, which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds, is:200 m225 m245 m250 m
Question
The length of the bridge, which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds, is:
- 200 m
- 225 m
- 245 m
- 250 m
Solution
To solve this problem, we first need to convert the speed of the train from km/hr to m/s.
1 km/hr = 5/18 m/s
So, 45 km/hr = 45 * (5/18) = 25 m/s
The train crosses the bridge in 30 seconds. The distance covered in this time is the length of the train plus the length of the bridge.
So, Distance = Speed * Time
Therefore, 130m (length of the train) + Length of the bridge = 25 m/s * 30 s
Solving for the length of the bridge gives us:
Length of the bridge = (25 m/s * 30 s) - 130 m = 750 m - 130 m = 620 m
So, the length of the bridge is 620 meters. However, this option is not available in the choices provided. Please check the problem statement again.
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