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Aptitude Day 283

Problems on Trains 

Formulae:

  • Time taken by a train of length ‘l’ meters to pass a pole or standing man = Time taken by the train to cover that same ’l‘ meters.
  • Time taken by a train of length ‘l’ meters to pass a stationary object of length ‘a’ meters is the time taken by the train to cover ‘(l+ a)’ meters.
  • If 2 trains are moving in the same direction, their relative speed should be their sum and the time taken by the 2 trains to cross each other = Sum of their lengths/ Relative speed.
  • If they run in the opposite direction, their relative speed will be their difference and the time taken by the 2 trains to cross each other = Sum of their lengths/ Relative speed.
  • If 2 trains start at the same time from points A and B towards each other and after crossing they take a and b seconds in reaching B and A respectively, then 
                                          (A’s speed): (B’s speed) = (b)1/2 : (a)1/2   

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