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Kibet left school by bicycle at 8.00 am and took 1#frac{1}{2}# hours to reach the market 20km away. Akinyi left the school for the market by car at 8.30 am. The average speed of the car was 80km/h. What was the difference between their arrival times?
A. 1 hour 15 minutes
B. 45 minutes
C. 30 minutes
D. 15 minutes