Discussion
How many seconds will a 500 metre long train take to cross a man walking with a speed of 3 km/hr in the direction of the moving train if the speed of the train is 63 km/hr?
Answer: B
The man walks the same way, so the speeds subtract.
\[ \text{relative speed} = 63 - 3 = 60 \text{ km/hr} = 60 \times \frac{5}{18} = \frac{50}{3} \text{ m/s} \]
\[ t = \frac{500 \times 3}{50} = 30 \text{ seconds} \]
Only the train's own length counts, since the man occupies a single point.
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