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A motorists traveling at an average speed of 84km /h took 2 hours 30 minutes to travel from town M to town N. She then took 3 hours and 20 minutes to travel back to town M. what was the average speed for the whole journey?
A. 36km/h
B. 63km/h
C. #73frac{1}{2}# km/h
D. 72km/h