Mathematics, 14.09.2019 01:30 ogdeekin
Two planes fly in opposite directions. one travels 400 mi/h and the other 600 mi/h. how long will it take before they are 4,000 mi apart?
Answers: 1
![\bf \begin{array}{lcccl} &\stackrel{miles}{distance}&\stackrel{mph}{rate}&\stackrel{hours}{time}\\ \cline{2-4}&\\ \textit{plane A}&d&400&t\\ \textit{plane B}&4000-d&600&t \end{array}\qquad \qquad \begin{cases} \boxed{d}=400t\\\\ 4000-d=600t \end{cases} \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{substituting on the 2nd equation}}{4000-\boxed{400t}=600t}\implies 4000=1000t\implies \cfrac{4000}{1000}=t\implies 4=t](/tpl/images/0230/6027/cebde.png)
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Two planes fly in opposite directions. one travels 400 mi/h and the other 600 mi/h. how long will it...
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