Respuesta :

[tex]\bf \qquad \qquad \textit{direct proportional variation}\\\\ \textit{\underline{y} varies directly with \underline{x}}\qquad \qquad y=kx\impliedby \begin{array}{llll} k=constant\ of\\ \qquad variation \end{array}\\\\ -------------------------------\\\\ \textit{\underline{time} varies directly with \underline{distance}}\qquad t=kd \\\\\\ \textit{we also know that } \begin{cases} t=\stackrel{seconds}{10}\\ d=\stackrel{miles}{2} \end{cases}\implies 10=k2\implies \cfrac{10}{2}=k[/tex]

and surely you know how much that is.

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