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Chebet left town P at 7.00am and travelled to town R, a distance of 320km via town Q. She took two hours to travel from town P to town Q at an average speed of 85 km/h. After a 45 minutes rest she continued with the journey at an average speed of 75km/h. At what time did she arrive at town R?
A. 11.45am
B. 11.00am
C. 9.45am
D. 9.00am