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**Time and Distance problems**

**Average Speed=Total distance/Total time**

- When they are more than one average speed then in order to find the average speeds of all here are some conditions

**When time is constant Average speed is Average of all speeds.****When distance is constant then average speed is Harmonic mean of all average speeds.**

**For e.g: Two speeds s**

_{1},s_{2 }Average speed=2/((1/s1)+(1/s2))###
**Train Problems:**

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**A train of length ‘l’ speed ‘s’ crossing a
pole(man) of negligible length then time taken by train to train is**

**T=l/s**

**2 A train of length ‘l’ and speed ‘s’ crossing a platform of length ‘l**

T=(l+lp)/s

_{p}’, then time taken by train to cross platform isT=(l+lp)/s

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**Relative speed Problems:**

**In solving Relative speed problems there arises two cases**

**Case 1: When two objects of speeds s1, s2 are moving in the same direction then relative speed is difference of their speeds (i.e., s1~s2)**

**Case 2: When two objects of speeds s1, s2 are moving in the opposite direction then relative speed is sum of their speeds (i.e., s1+s2)**

*To remember more things constant repetition is a way. The mind only remembers a quarter of what you hear.*

Excellent explanation by admin ..........

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