A boy riding a bicycle moves along a straight road in three successive stages:
(i) 500m east in 100s,
(ii) 300m west in 60s, and
(iii) 200m east in 40s.
Taking the eastward direction as positive, answer the following:
(a) Find the total distance travelled and the total time taken.
(b) Calculate the net displacement.
(c) Determine the average speed for the entire motion.
(d) Determine the average velocity for the entire motion, stating its sign and magnitude.