What is the time taken by a train running at 54 km/hr to cross a man standing on a platform, the length of the train being 180 m?
a)6 seconds b)12 seconds c)16 seconds d)18 seconds

• ans b
  speed= 54 km/hr = 15 m/sec
  time=180/15=12 sec
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• m=180
  d=15
  s=180/15=12
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• speed in meters/seconds=54*1000/3600=15m/s;
  time = length/speed;
  time = (180m)/(15m/s) = 12 seconds..
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