Distance , Displacement(MOTION IN A STRAIGHT LINE)

Examples:

1)  Suppose a bus starting from station A travels 15000 m to reach stationB then the distance covered by the bus is 15000 m. Now if the bus returns to the station A  then distance covered is 15000 m and the total distance covered by the bus during the trip from A to B and then back to A from B is
15000 m + 15000 m = 30000 m. 

A bus moving from A to B and again from B to A  
But the displacement when the bus moves from A to B and then from B to A is zero

2)  Suppose a person moves 3 meters from A to B and 4 meters from B to C as shown in the figure. The total distance traveled by him is 7 meters and he is displaced only by 5 m which is the shortest distance between his initial position and final position.