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**What is Speed**

**What is Time**

**What is Distance**

**Conversion of km/hr to m/sec**

**Conversion of m/sec to km/hr**

**Ratio of speeds of A and B is a:b: then ratio of the time taken by them to cover the same distance**

**Average speed of journey when certain distance covered by x km/hr and y km/hr**

**Relative speed of two persons moving with u m/s and v m/s in same direction where u>v**

**Relative speed of two persons moving with u m/s and v m/s in opposite direction where u>v**

**Two persons A and B start at the same time in opposite directions from two points then after passing each other they complete the journey in a and b hours the ratio of speeds of A and B.**