Question 1103391
You can think of this as 1 truck moving
at the sum of their speeds and the
other truck standing still
Let {{{ t }}} = minimum time in hrs for them to 
be {{{ 50 }}} km apart
------------------------------------
{{{ ( 65 + 60 )*t >= 50 }}}
{{{ 125t >= 50 }}}
{{{ t >= .4 }}} hrs
also
{{{ t >= .4*60 }}} min
{{{ t >= 24 }}} min
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check:
{{{ d[1] = 65*.4 }}}
{{{ d[1] = 26 }}} km
and
{{{ d[2] = 60*.4 }}}
{{{ d[2] = 24 }}} km 
and
{{{ d[1] + d[2] = 26 + 24 }}}
{{{ d[1] + d[2] = 50 }}} km
OK