Discussion
A train 240 m long crosses a bridge in 30 seconds while running at 72 km/hr. What is the length of the bridge ?
Answer: D
Correct answer: 360 m
\[\text{Speed} = 72 \times \frac{5}{18} = 20 \text{ m/s}\]
\[\text{Total distance covered} = 20 \times 30 = 600 \text{ m}\]
That total is the train plus the bridge, so the bridge is \(600 - 240 = 360\) m.
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