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Rono cycled from town R at an average speed of 72km/h and took 3 hours 30 minutes to reach town S. Kepha cycled the same distance and took 4 hours. At what average speed was Kepha cycling?
A. 18km/h
B. #33frac{3}{5}# km/h
C. 63km/h
D. 252km/h