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It suddenly rained when I went to the library to borrow books.
Let's assume that mom catches up with Xiao Fang after x minutes, so mom walks 8 * 65 = 520m longer than Xiao Fang, mom walks 85x and Xiao Fang walks 65x, so 85x-65x=520 and x=26, that is, mom will catch up with Xiao Fang after 26 minutes, and the distance from home at this time is the distance mom walks S = 26 * 85 = 2265433.
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