A person starts from point X at 6:00am . He reaches point Y and Z at 7:00 am amd 9:00am respectively. When he takes 2 hours to teturn to point X and the distance XY and YZ is 30 km and 60 km respectively, calculate the average speed of the person
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Explanation:
the person come back in 2 hrs but he took 3 hrs while move from x to z
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