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1. Smart Formulas :
1. Speed = distance/time
s = d/t
2. 2. Time taken by a train x meters long to pass a pole or standing man or a post = Time taken by the train to travel x meters.
3.
3. Time taken by a train x meters long to pass an object of length y meters = Time taken by the train to travel (x + y) metres.
4. Suppose two trains or two objects are moving in the same direction at v1 m/s and v2 m/s where v1 > v2,
then their relative speed = (v1 – v2) m/s
5. 4. Assume two trains of length x metres and y metres are moving in opposite directions at v1 m/s and v2 m/s, Then
The time taken by the trains to cross each other = (x+y) / (v1+v2) seconds
6. 5. Assume two trains of length x metres and y metres are moving in the same direction at at v1 m/s and v2 m/s where v1 > v2, Then
The time taken by the faster train to cross the slower train = (x+y) / (v1-v2) seconds
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