Tuesday, March 18, 2014

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Problems On Train - Aptitude Concepts (Important Facts And Formulae)


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IMPORTANT FACTS AND FORMULAE


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

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

3. Time taken by a train of length 1 metres to pass a pole, a standing man, a signal post is equal to the time taken by the train to cover 1 metres.

4. Time taken by a train of length 1 metres to pass a stationary(static) object of length b metres is equal to the time taken by the train to cover (1 + b) metres.

problems-on-train-aptitude-question-answer-important-formulae-concepts


5. Let two trains or say two bodies are moving in the same direction at u m/s and v m/s,
    where u > v,
    then their relatives speed =

(u - v) m / s.

6. Let two trains or say two bodies are moving in opposite directions at u m/s and v m/s,
   then their relative speed is =

(u + v) m/s.

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

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

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

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

9. If the two trains (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's speed) : (B’s speed) = (b1/2: a1/2).



Mainly Used Formulae


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