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The answer to the 48-page synchronous exercise of mathematics in the first volume of the fourth grade of West Normal University Edition (Question 9)
Solution:

The time from Wang Hong to the museum is:10+(2400-60 *10)/60 = 40 minutes.

Xiaodong 40- 10=30 minutes to the museum.

So Xiaodong is 2400/30 = 80m each.

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