Question 627452
You can think of one of the motorists as standing still
and the other one traveling at the sum of their speeds
So {{{ 400 }}} miles will be covered by a car going
{{{ 42 + 38 = 80 }}} mi/hr
{{{ 400 = 80t }}}
{{{ t = 5 }}} hrs
They will meet 5 hrs after 1 PM or 6 PM