Answer:
- Private jet - 165 mph
- Commercial jet - 231 mph
Explanation:
Let the speed of the private jet is p and commercial jet is c.
Set equations
Solve by substitution
- 7p = 5(2p - 99)
- 7p = 10p - 495
- 10p - 7p = 495
- 3p = 495
- p = 495/3
- p = 165
Find c:
- c = 2*165 - 99 = 330 - 99 = 231