Question 906700
VARIABLIZED RATES
Alan's rate of speed is?  {{{r}}}  Mph
Ben rate of speed is ?   {{{r+1/2}}} Mph


They are walking toward each other so they approach at a rate {{{r+r+1/2}}} mph, or {{{2r+1/2}}} mph.


t=4 hours
d=12.4 miles
{{{highlight_green((2r+1/2)*4=12.4)}}}
Solve for r.