A girl moves with the speed of 6 km/h for 2 hours and with the speed of 4 km/h for the next 3 hours. Find the total distance moved and average speed of the girl.
a) 26 km, 5.2 km/h
b) 20 km, 4 km/h
c) 30 km, 6 km/h
d) 18 km, 3.6 km/h