Question 1166630
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..., flew 1110 miles in a corporate jet but returned in a smaller plane that could fly only half as fast. If the total travel time was 9 hours, find the speeds of the planes.
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r, speed of small plane
2r, speed of jet
d = 1110 miles
t = 9 hours total
<pre>
                  SPEED       TIME       DISTANCE

Jet               2r         d/(2r)       d         

Plane              r          d/r         d

TOTAL                        t
</pre>
Solve this time sum equation for r:
{{{highlight_green(d/(2r)+d/r=t)}}}