(75*4+60*4)/(75-60)
=540/15
=36MIN
丁丁每分钟走75米,小胖每分钟走60米,两人同时同地出发,背向面行,4分钟后丁丁转身
丁丁每分钟走75米,小胖每分钟走60米,两人同时同地出发,背向面行,4分钟后丁丁转身
数学人气:162 ℃时间:2019-10-11 02:25:38
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