Two mobiles (RO)
The rectilinear movement of two mobiles are described by the motions laws  x1=3t and  x2=10–t
 where x is  expressed in meters and t  in seconds. The mobiles start at the same time t0=0 s. Find out:
a.       The graphical representation of the coordinates of the movable laws of the mobile;
b.      The time and the place where the two mobiles meet.