Question 388835
On monday:
{{{d = r*t}}}
(1) {{{d = r*2}}}
On Tuesday:
{{{d = (r + 15)*(2 - .5)}}}
(2) {{{d = 1.5*(r + 15)}}}
Substitute (1) into (2)
{{{2r = 1.5r + 1.5*15}}}
{{{.5r = 22.5}}}
{{{r = 45}}}
And, from (1),
{{{d = r*2}}}
{{{d = 45*2}}}
{{{d = 90}}}
He travels 90 mi to work