1. Find the average velocity:

* The initial velocity (v₁) is 75 m/s.

* The final velocity (v₂) is 145 m/s.

* The average velocity (vₐ) is the average of the initial and final velocities:

vₐ = (v₁ + v₂) / 2 = (75 m/s + 145 m/s) / 2 = 110 m/s

2. Calculate the distance:

* The time (t) is 15 seconds.

* The distance (d) traveled is the product of the average velocity and the time:

d = vₐ * t = 110 m/s * 15 s = 1650 meters

Therefore, the plane flies 1650 meters in 15 seconds.