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✨ Best Answer ✨

x[km] / 4[km/h] + x[km] / 6[km/h] = 2.5[h]
x/4+x/6=5/2
両辺に12を掛けて
3x+2x=30
5x=30
x=6
AB間は6[km]

るぅ

ありがとうございます🥺

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