Question 1151747
Think of this as one plane standing still and the
other flying at the sum of their speeds
Let {{{ s }}} = the speed of the slower plane in mi/hr
{{{ s + 75 }}} = the speed of the faster plane in mi/hr
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{{{ 2475 = ( s + s + 75 )*3 }}}
{{{ 825 = 2s + 75 }}}
{{{ 2s = 750 }}}
{{{ s = 375 }}}
and
{{{ s + 75 = 450 }}}
Their speeds are 375 mi/hr and 450 mi/hr
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check:
{{{ d[1] = 375*3 }}}
{{{ d[1] = 1125 }}}
and
{{{ d[2] = 450*3 }}}
{{{ d[2] = 1350 }}}
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{{{ d[1] + d[2] = 1125 + 1350 }}}
{{{ d[1] + d[2] = 2475 }}}
OK