The body is thrown vertically upward with an initial velocity vo = 30 m / s. What path did it travel in time

The body is thrown vertically upward with an initial velocity vo = 30 m / s. What path did it travel in time = 4 s? What are its average travel speed and average track speed during this time? The air resistance is not taken into account the answer is there but there is no solution help plizzz S = 50m, Uav = 10m / s, Uav = 12.5m / s

You should know that: v0 = g * t1, in turn t1 = 3.
Let’s write the formula:
S = V0 * t1 – g * t1 ^ 2/2 + g * t2 ^ 2/2;
S = 30 * 3 – 10 * (9-1) / 2;
S = 90 – 40;
S = 50.
Then:
Vput = 50/4;
Vput = 12.5;

30 * 3 – 10 * 9/2 = 45;

Sper. = 45 – (50 – 45) = 40;

V = 40/4 = 10 m / s.
Answer: 10 m / s.