[tex]Answer:\\ Let\: x\: be\: the\: miles\: they\: run \\ \Rightarrow We \: have \: an \: equation:0.55x + 35 + 20 = 0.65x + 45 \\ \Leftrightarrow 0.65x + 45 = 0.55x + 55 \\ \Leftrightarrow 0.1x = 10\Leftrightarrow x = 100 \\ \Rightarrow The \: rental \: costs \: of\: both \: companies \: are \: the \: same \: at \: 100 \: miles[/tex]
