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A bus left town Y for town Z, a distance of 80 kilometers, at 8.30 am. For the first 30 minutes, it travelled at 50km/h. It travelled the remaining distance at 66km/h. At what time did the bus reach town Z?
A. 9.10 am
B. 9.20 am
C. 9.50 am
D. 10.12 am