Question 431662
Train A got a 2 hour head start. At 45 mi/hr
{{{ d[1] = 45*2 }}}
{{{ d[1] = 90 }}} miles is the head start
At 6 PM the trains are {{{ 450 - 90 = 360 }}} miles apart
you can think of one train standing still and the other
heading towards it at the sum of their speeds
{{{ 360 = (45 + 60)*t }}}
{{{ t = 360/105 }}}
{{{ t = 24/7 }}}
{{{ t = 3.429 }}} hrs
They meet at 9:26 PM (to nearest minute)