Question 1078945
You can think of this as one of the trains standing still
and the other one traveling at the sum of their speeds
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Let {{{ t }}} = time in hrs for them to be 224 mi apart
{{{ 224 = ( 85 + 75 )*t }}}
{{{ 224 = 160t }}}
{{{ t = 1.4 }}} hrs
( you can convert hrs to min )
{{{ .4*60 = 24 }}} min
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It will take them 1 hr and 24 min to be 224 mi apart
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check:
{{{ d[1] = 85*t }}}
{{{ d[1] = 85*1.4 }}}
{{{ d[1] = 119 }}} mi
and
{{{ d[2] = 75*t }}}
{{{ d[2] = 75*1.4 }}}
{{{ d[2] = 105 }}}
and
{{{ d[1] + d[2] = 119 + 105 }}}
{{{ d[1] + d[2] = 224 }}}
OK