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Senteu left home at 6.00 am for school which is 8km away. He cycled at a speed of 6km/h. After cycling for 4km the bicycle had a puncture which took him 15 minutes to repair. He continued cycling at the same speed. At what time did he arrive at school?
A. 6.40am
B. 6.55 am
C. 7.20 am
D. 7.35 am