A point P is taken to be origin of time and position . Two points  Q  and R are situated on a straight line  passing through P . The positions of Q and R  are 8m and 12m  respectively while the instant at which the body reach these points are 3s and 5s . WHAT IS THE SPEED OF THE BODY?????

Here in this question it is given that the position of point Q and R are 8m and 12m respectively and corresponding times are 3sec and 5sec.
Now the line joining Q and R is a straight line passing through the origin P. This tells us that the velocity of the body is constant.
Therefore, speed is given by

Plot the graph between distance and time for better understanding.
Hope this helps,
Good luck.

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