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Home->Aptitude->Problems on Trains -> Important Formulas

Problems on Trains :-

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IMPORTANT EXAMPLES
::Important Formulas

Here Some Basic Formulas/Rules Are given below :-

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

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

3. Time taken by a train of length 1 metres to pass a pole or a standing man or 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 object of length b metres is the time taken by the train to cover (I + b) metres.

5. Suppose two trains or two bodies are moving in the same direction at u m / s and y m / s, where u > y, then their relatives speed = (u - y) m/ s.

6. Suppose two trains or two bodies are moving,in opposite directions at u m / s and y m / s, then their relative speed is = (u + y) m/s.

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

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

9. If 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) = ( √a : √b )

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