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从家到校50米/分行走迟到8分钟，60米/分提前5分钟到校，几点出发
一个学生从家到学校，如果以每分钟50米的速度行走，就要迟到8分钟；如果以每分钟60米的速度前进，就可以提前5分钟到校。这个学生出发时离上学时间有多少分？
小学四年级数学，奥数举一反三，思维培养训练题177/215
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