Question 1122466
<br>
The jet flies in 3 hours the same distance that the passenger plane flies in 5 hours; that means the ratio of the speeds of the two planes is 5:3.<br>
Knowing that ratio, let the speed of the passenger plane be 3x and the speed of the jet be 5x.<br>
The difference in speeds is 140 km/h:<br>
5x-3x = 2x
2x = 140
x = 70<br>
The speed of the passenger plane is 3x = 210 km/h; the speed of the jet is 5x = 350 km/h.