Question
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: Option B
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Speed of the train relative to man
= (63 - 3) km/hr
= 60 km/hr
= \(\left(60\times\frac{5}{18}\right)m/sec\)
=\(\left(\frac{50}{3}\right)m/sec\)
Thairfor Time taken to pass the man = \(\left(500\times\frac{3}{50}\right)sec\)
= 30 sec.
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