Question 1077582
Let n be the speed of the small plane. Then the jet flies at n+180. So:
720/n=720/n+180  +2
720(n+180)=720n+2n²+360n
2n²+360n-129600=0
n²+180n-64800=0
(n+360)(n-180)=0
n=-360 or 180
Using the positive value, we get the speed of the two engine plane to be 180 mph, and that of the jet to be 360 mph. &#9786;&#9786;&#9786;&#9786;