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OR
Adhiambo left home and cycled for 1frac{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 7frac{1}{2} km/h. What was the average speed for the whole journey?
B. 7frac{5}{7} km/h
C. 7frac{3}{4} km/h
D. 6frac{3}{4} km/h