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Adhiambo left home and cycled for 1`frac{1}{2}` hours at an average speed of 8km/h. She rested for 30 minutes and continued with the journey for 2 hours at an average speed of 7`frac{1}{2}` km/h. What was the average speed for the whole journey?
A. 27km/h
B. 7`frac{5}{7}` km/h
C. 7`frac{3}{4}` km/h
D. 6`frac{3}{4}` km/h