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Problems on Trains

Q1:

  A train 125 m long passes a man, running at 5 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is

A 45 km/hr

B 50 km/hr

C 54 km/hr

D 55 km/hr

ANS:B - 50 km/hr

Speed of the train relative to man = 125 m/sec
10
 
   = 25 m/sec.
2
   
   = 25 x 18 km/hr
2 5
   = 45 km/hr. Let the speed of the train be x km/hr. Then, relative speed = (x - 5) km/hr.  x - 5 = 45          x = 50 km/hr.



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