Question 1105899
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An aircraft flies AGAINST THE wind a distance of 768km in 4 hours. It returns with  the wind in 3 hours.
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<pre>
                  SPEED        TIME         DISTANCE
AGAINSTWIND       r-w           4           768
WITHWIND          r+w           3           768
</pre>

{{{system(r-w=768/4,r+w=768/3)}}}


{{{system(r-w=192,r+w=256)}}}-----ready for Elimination Method


{{{highlight(r=224)}}}------speed of aircraft without any wind
and
{{{highlight(w=32)}}}------speed of wind