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歩く速さをxm/分
走る速さをym/分
とすると、道のり=速さ×時間、3㎞は3000mなので、
行きは5x+15y=3000
帰りは20x+10y=3000
これを解いて、x=60、y=180
よって、
歩く速さを60m/分
走る速さを180m/分

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