A 100 m long train crosses a man travelling at `5 kmh^(-1)` , in oppos – InterviewSolution

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1.	A 100 m long train crosses a man travelling at `5 kmh^(-1)` , in opposite direction, in `7.2 s` then the velocity of train isA. 40 km/hrB. 25 km/hrC. 20 km/hrD. 45 km/hr
Answer» Correct Answer - D Length of train L=100m Let speed of train `=v_(1)` and speed of man `v_(m)=5 km//hr` relative speed `=v_(1)+v_(m)` `v_(rel)=("Separation")/("Time")=(100)/(7.2)m//s` `=(1000)/(72)xx(18)/(5)=50 km//hr` `therefore v_(1)+5=50 rArr v_(1)=45 km//hr`

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