Question 898332
Think of this a s one car moving at the 
sum of their speeds and the other
standing still
{{{ let {{{ t }}} = time in hours
{{{ 427 = ( 60 + 62 )*t }}}
{{{ t = 427 / 122 }}}
{{{ t = 3.5 }}}
it will take them 3.5 hrs
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check:
{{{ d[1] = 60t }}}
{{{ d[1] = 60*3.5 }}}
{{{ d[1] = 210 }}} mi
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{{{ d[2] = 62t }}}
{{{ d[2] = 62*3.5 }}}
{{{ d[2] = 217 }}}
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{{{ d[1] + d[2] = 210 + 217 }}}
{{{ d[1] + d[2] = 427 }}}
OK