A flash drum operating at $300\mathrm{.}0$kPa is separating a mixture that is $40\mathrm{.}0$mol$\%$ isobutane,

$25\mathrm{.}0$mol$\%n-$pentane and $35\mathrm{.}0$mol$\%n-$hexane. We want a $90\%$ recovery of $n-$hexane in the

liquid. $F=1000\mathrm{.}0$kmo$\frac{l}{h}.$ Find $T_{\text{d}\text{r}\text{u}\text{m}},\frac{V}{F}$ and the composition of both streams.