A delivery van starts from point O on a straight highway. The positive direction is taken toward the east. The van moves in the following sequence:
(a) 3.2km east to point A
(b) 1.4km west to point B
(c) 2.6km east to point C
(d) 0.8km west to point D
(i) Calculate the total distance covered by the van up to point D.
(ii) Determine the net displacement of the van from point O to point D.
(iii) Find the ratio of the distance obtained in (i) to the magnitude of the displacement obtained in (ii). Give your answer correct to two decimal places.