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光の速さを、300000(km/s)=3.0×10⁸(m/s)として

【時間=道のり÷速さ】から

 (1.5×10¹¹)÷(3.0×10⁸)=0.5×10³=500s

 500s=60×8+20 で、8分20秒

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