Question 1048674
Think of this as one of the planes standing
still and the other one flying at the sum of their speeds
---------------------
Let the speed of the slower one = {{{ s }}}
The speed of the faster one = {{{ s + 65 }}}
---------------------------------------
{{{ 2660 = ( s + s + 65 )*4 }}}
{{{ 2660 = ( 2s + 65 )*4 }}}
{{{ 2660 = 8s + 260 }}}
{{{ 8s = 2400 }}}
{{{ s = 300 }}}
and
{{{ s + 65 = 365 }}}
The speed of the slower plane is 300 mi/hr
The speed of the faster plane is 365 mi/hr
---------------------------------------
check answer:
{{{ d[1] = 300*4 }}}
{{{ d[1] = 1200 }}} mi
and
{{{ d[2] = 365*4 }}} 
{{{ d[2] = 1460 }}} mi
and
{{{ d[1] + d[2] = 1200 + 1460 }}}
{{{ d[1] + d[2] = 2660 }}} mi
OK