Question : A train 100 metres long is running at a speed of 30 km/hr. The time (in seconds) in which it will pass a man standing near the railway line is:
Option 1: 10
Option 2: 11
Option 3: 12
Option 4: 15
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Correct Answer: 12
Solution :
Distance covered by train when the train crosses a standing man = length of the train
Distance = 100 m
Speed = 30 km/hr = 30 $\times \frac {5}{18} m/s= \frac{25}{3} m/s$
Required time = $\frac{100}{\frac{25}{3}} = \frac{300}{25} = 12 \;sec $
Hence, the correct answer is 12 sec.
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