A person walks 3km due east in 30min, then 4km due north in 40min, and finally 3km due west in 30min. Which of the following pairs correctly gives (average speed, magnitude of average velocity) for the entire 100min journey?
a) (6km h−1,6km h−1)
b) (7.1km h−1,2.9km h−1)
c) (6km h−1,2.4km h−1)
d) (6km h−1,0km h−1)