To find the displacement of the plane during the third leg (as a vector), multiply the velocity of the plane times the time that it travels at that velocity:

The velocity of the plane with respect to the ground v_PG is equal to the velocity of the plane with respect to the wind v_PW, plus the velocity of the wind with respect to the ground v_WG:

The direction of the wind is θ=280°, and its speed is 35mph:

The direction of the plane with respect to the wind is θ=70, and the magnitude of its velocity is the same as in the 2nd leg, which is 560mph. Then:

Add both velocities to find the velocity of the plane with respect to the ground:

Since 20 minutes is 1/3 of an hour, then the displacement during the third leg of the trip, is:

1st question:
To find the position of the plane from the origin, add the displacement vector to the position before the 3rd leg started, which is:

Then, the final position after the third leg, is:

Then, the final location of the plane, is:

2nd question:
To find how far from the take-off point the plane is, calculate the magnitude of the vector r:
![\begin{gathered} |\vec{r}|=\sqrt[]{r_x+r_y} \\ =\sqrt[]{(642mi)^2+(523mi)^2} \\ =828\text{miles} \end{gathered}](https://img.qammunity.org/2023/formulas/physics/high-school/2uxycfngmym8hd87szddsuslo5k5m0tsop.png)
Therefore, the plane is 828 miles away from the take-off point.
3rd question:
To find the direction of the plane (the angle θ), remember that:

Therefore, the direction of the plane is 39° from the East toward the North.