Question 221219
Set up the proportion (or ratio!) {{{(4 miles)/(30 min)=(x mi)/(18 min)}}}


Since {{{a/b=c/d}}} means {{{ad=bc}}},


{{{(4 miles)/(30 min)=(x mi)/(18 min)}}} means that {{{4*18=30*x}}}
{{{72=30x}}}
{{{x=72/30=2.4}}} mi.


R^2