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Problems on Trains - General Aptitude

Q1:

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?

A 25

B 30

C 40

D 45

ANS:B - 30

Speed of the train relative to man = (63 - 3) km/hr
  = 60 km/hr
 
= ( 60 x 5 ( m/sec
18
 
= ( 50 ( m/sec.
3
Therefore Time taken to pass the man
= ( 500 x 3 ( sec
50
  = 30 sec.