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BookGeek
Since he walks 900 meters each day, and the answer is for 10 days. You would multiply 900 by 10., and divide by 1000. The answer is: 
D) 9

The problem says 900 "meters" not kilometers. So you would divide the final answer by 1000.
musiclover10045

900 * 10 = 9000 meters

9000/1000 = 9 km

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