Question 1110033
You can think of this as one plane flying
at the sum of their speeds and the other
plane standing still
Let {{{ s }}} = the speed of one plane in mi/hr
Let {{{ s + 25 }}} = the speed of the other plane in mi/hr
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{{{ 490 = ( s + s + 25 )*2 }}}
{{{ 490 = ( 2s + 25 )*2 }}}
{{{ 490 = 4s + 50 }}}
{{{ 4s = 440 }}}
{{{ s = 110 }}}
and
{{{ s + 25 = 135 }}}
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Their speeds are 110 mi/hr and 135 mi/hr
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check:
{{{ d[1] = 110*2 }}}
{{{ d[1] = 220 }}}
and
{{{ d[2] = 135*2 }}}
{{{ d[2] = 270 }}}
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{{{ d[1] + d[2] = 220 + 270 }}}
{{{ d[1] + d[2] = 490 }}} mi
OK