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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