1.** km/hr to m/s conversion:**

2.** m/s to km/hr conversion:**

3. **Formulas for finding Speed, Time and Distance**

4. Time taken by a train of length *l* meters to pass a pole or standing man or a signal post is equal to the time taken by the train to cover *l* meters.

5. Time taken by a train of length *l* meters to pass a stationary object of length *b* meters is the time taken by the train to cover (*l* + *b*) meters.

6. Suppose two trains or two objects’ bodies are moving in the same direction at *u* m/s and *v* m/s, where *u* > *v*, then their relative speed is = (*u* – *v*) m/s.

7. Suppose two trains or two objects’ bodies are moving in opposite directions at *u* m/s and *v* m/s, then their relative speed is = (*u* + *v*) m/s.

8. If two trains of length a metres and *b* metres are moving in opposite directions at *u* m/s and *v* m/s, then:

9. If two trains of length *a* meters and *b* meters are moving in the same direction at *u* m/s and *v* m/s, then:

10. 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: