Question : A 1000-metre-long train is running at the speed of 72 km/hr. If it crosses a bridge in 85 seconds, then what is the length of the bridge?
Option 1: 800 metres
Option 2: 700 metres
Option 3: 950 metres
Option 4: 750 metres
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Correct Answer: 700 metres
Solution : A 1000-metre-long train is running at the speed of 72 km/hr. In 85 seconds it crosses a bridge. In 85 seconds the train travels = $\frac{72000}{3600}×85=1700$ metres When the train crosses a bridge, the distance covered by the train is the sum of the train's length and the bridge's length. So, the length of the bridge = 1700 – 1000 = 700 metres Hence, the correct answer is 700 metres.
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