Question 687385
Think of the train at the station as standing still
and the disabled train is moving at the sum of their speeds
The disabled train has to travel 168 miles to get
to the station.
Let {{{ t }}} = the time in hours to get to the station
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{{{ 168 = ( 32 + 80 )*t }}}
{{{ 168 = 112t }}}
{{{ t = 168/112 }}}
{{{ t = 1.5 }}}
They will meet 1.5 hrs after 4 PM, or 5:30 PM