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A cyclist set out to travel from town N to town P. After travelling for 1 hour 30min he had a tyre puncture, which took him 30 minutes to repair. He then continued with the journey for 50 minutes. If his average speed for the whole journey was 18km/h, how far is town P from town N?
A. 32.6km
B. 37.8km
C. 42km
D. 51km