Mathematics, 04.07.2019 22:30 badaxz
Two people start walking at the same time in the same direction. one person walks at 8 mph and the other person walks at 7 mph. in how many hours will they be 0.25 miles apart?
Answers: 1
![\bf \boxed{A}\stackrel{8~mph}{\rule[0.35em]{15em}{0.25pt}} \\\\\\ \boxed{B}\stackrel{7~mph}{\rule[0.35em]{13em}{0.25pt}}](/tpl/images/0051/8025/acc5c.png)
![\bf \begin{array}{lcccl} &\stackrel{miles}{distance}&\stackrel{mph}{rate}&\stackrel{hours}{time}\\ \cline{2-4}&\\ A&d+\frac{1}{4}&8&t\\ B&d&7&t \end{array}~\hspace{4em} \begin{cases} d+\cfrac{1}{4}=8t\\[1em] \boxed{d}=7t \end{cases} \\\\\\ \boxed{7t}+\cfrac{1}{4}=8t\implies \cfrac{1}{4}=t\impliedby \begin{array}{llll} \textit{after }\frac{1}{4}\textit{ of an hour}\\\\ \textit{or 15 minutes} \end{array}](/tpl/images/0051/8025/e46ce.png)
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