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設兩地距離為A,那麼預計時間就是A/40,實際使用時間就是A/40 + 45/60.得出方程.A=40*3+(40-10)(A/40 + 45/60 -3).通過方程得出A=120- 3A/4 +22.5-90最後算出A=210
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