A cyclist covers the following four successive segments: (i) 2km east at 12km/h, (ii) 3km north at 12km/h, (iii) 4km west at 6km/h, and (iv) 3km south at 6km/h. Which of the following pairs gives the correct values of (average speed ; magnitude of average velocity) for the entire journey?
a) (7.6km/h;7.6km/h)
b) (9.0km/h;9.0km/h)
c) (7.6km/h;1.3km/h)
d) (7.6km/h;2.0km/h)