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A math problem: seventh-grade students in a school can't go to the museum from school.
Solutions; When the walking speed is xkm/,

15/60(x+8)=( 1/2+ 15/60)x

1/4x+2=3/4x

3/4x- 1/4x=2

1/2x=2

x=4

That is, when the walking speed is 4km/.

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