The slower plane travels at x km/h. The faster plane travels at (x+67) km/h
The speed of separation is the sum of the speeds, (2x+67) km/h
They are 16281 km after 9 hours of travel.
speed = distance/time
[tex]\begin{gathered} 2x+67=\frac{16281}{9} \\ 2x+67=1809 \\ 2x+67-67=1809-67 \\ 2x=1742 \\ \frac{2x}{2}=\frac{1742}{2} \\ x=871 \end{gathered}[/tex]The slower plane travels at 871 km/h
[tex]x+67=871+67=938[/tex]The faster plane travels at 938 km/h
