Aptitude - Trains


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Important Terms

  1. Speed in km/hr

    a km /hr = (a * 5 / 18) m/s.

  2. Speed in m/s

    a m/s = ( a * 18/5) km/hr.

  3. Time taken by a train of length L metres to pass a pole or a standing man or a signal post is equal to the time taken by the train to cover

    L Metres.

  4. Time taken by a train of length L metres to pass a stationary object of length b metres is the time taken by the train to cover

    (L + b) metres.

  5. Suppose two train or two bodies are moving in the same direction at u m/s and v m/s , where u > v, then their

    relative speed = (u – v) m/s.

  6. Suppose two trains or two bodies are moving in opposite directions at u m/s and v m/s , then their

    relative speed = ( u + v) m/s.

  7. If two trains of length a metres and b metres are moving in opposite directions at u m/s and v m/s, then time taken by the trains to cross each other =

    (a+b) / ( u+ v) sec.

  8. If two train s of length a metres and b metres are moving in the same direction at u m/s and v m/s , then the time taken by the faster train to cross the slower train =

    ( a+b) / (u + v ) sec.

  9. If two train ( or bodies) start at the same time from points A and B towards each other and after crossing they take a and b sec in reaching B and A respectively, then

    ( A  speed) : ( B speed) = ( √b : √a ).

Solved Examples

Solved Examples

aptitude_trains.htm
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