初一人教版暑假生活数学指导答案（一道题）
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800=80V1+80V2
10=V1+V2
990=99V1+99V2.........1
800=792V1-792V2
100=99V1-99V2.........2
1式-2式
890=198V2
V2=4.495米/秒
V1=10-4.495=5.505米/秒
答：甲、乙两人的速度为4.495米/秒、5.505米/秒
.
假设两人速度分别为x和y
（13*60+12）（x-y）=800
（60+12）（x+y）=800
甲、乙两人的速度为4.495米/秒、5.505米/秒
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