Question
A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?
Answer: Option A
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Formula for converting from km/hr to m/s: X km/hr = \(\left(x\times\frac{5}{18}\right)m/s.\)
Therefore, Speed = \(\left(45\times\frac{5}{18}\right)m/sec = \frac{25}{2}sec.\)
Total distance to be covered = (360 + 140) m = 500 m.
Formula for finding Time = \(\left(\frac{Distance}{Speed}\right)\)
Therefor Required time =\(\left(\frac{500\times2}{25}\right)sec = 40sec.\)
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