小明放学回家沿着某路公共汽车路线，沿途公路公共汽车每
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1\u00f7[\uff0814+112\uff09\u00f72]\uff0c=1\u00f716\uff0c=6\uff08\u5206\u949f\uff09\uff1b\u7b54\uff1a\u516c\u5171\u6c7d\u8f66\u53d1\u8f66\u65f6\u95f4\u95f4\u9694\u662f6\u5206\uff0e
7.875分设两车间距为L，车速V1,人速V2.
则L=（V1+V2)*7=(V1-V2)*9
可得V2=0.125V1
L=（V1+V2)*7=7.875V1
T=L/V1=7.875
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