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Muthoni left home at 7.00 am for the market, a distance of 7.2km. She reached the market at 8.20 am. What was her average speed in metres per second?
A. 1 m/s
B. #1frac{1}{2}# m/s
C. #1frac{1}{3}# m/s
D. #5frac{2}{5}# m/s