100m÷10s=10m/s これが平均の速さです
1時間は3600s(秒)なので
10m/s × 3600s = 36000m/h →1時間で36000m進む
1km = 1000m なので
36km/h ってなります。
単位で考えると分かりやすいと思いますよ
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