Two monitoring stations record the locations of a weather balloon at two successive instants: first at P(1.8,\,2.5) and later at Q(6.3,\,5.9). Treating the x–y plane as a horizontal map (units in kilometres):
(i) Calculate the slope of the path of the balloon between P and Q.
(ii) Determine the angle of inclination made by this path with the positive x-axis, correct to the nearest degree.
(iii) Suppose the balloon continues to ascend along the same straight path. Find the point at which the path would intersect the y-axis.