Question 650123
The 1st car has a head start of
{{{ 26*2 = 52 }}} mi
Start a stopwatch when you see the 2nd car
Stop the stopwatch when the 2nd car catches the 1st
Call that time {{{ t }}}
Let {{{ d }}} = the distance that the 2nd car travels
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Equation for 1st car:
(1) {{{ d - 52 = 26t }}}
Equation for 2nd car:
(2) {{{ d = 52t }}}
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Substitute (2) into (1)
(1) {{{ 52t - 52 = 26t }}}
(1) {{{ 26t = 52 }}}
(1) {{{ t = 2 }}} hrs
The 2nd car catches the 1st car in 2 hrs 
check answer:
(1) {{{ d - 52 = 26t }}}
(1) {{{ d - 52 = 26*2 }}}
(1) {{{ d - 52 = 52 }}}
(1) {{{ d = 104 }}} mi
and
(2) {{{ d = 52t }}}
(2) {{{ d = 52*2 }}}
(2) {{{ d = 104 }}} mi
OK