Answer:
1753.67 m
Explanation:
Using the law of cosine
[tex]c=\sqrt {(a^{2}+ b^{2}-2abcos\theta_{c})}[/tex]
After 2.9 hours, the first plane has moved 730*2.9=2117 Â m, let this be a
The second plane has moved 550*2.9=1595 m, let this be b
The angle between them is 111-56.8=54.2, let this be [tex]\theta_{c}[/tex]
[tex]c=\sqrt {(2117^{2}+ 1595^{2}-2abcos 54.2)}[/tex]
c=1753.67 m
