Answer:
The answer is 5 m/s
Explanation:
I assume that he was 30 meters below the volcano and that after 4.5 seconds, he was 7.5 meters below the edge.
That means that the distance covered by Shota was the difference between his initial position and his new position:
30 - 7.5=22.5 meters
And now, we can know how fast he was climbing by dividing the distance covered over the time he covered that distance:

So, he climbed the volcano at a constant rate of 5 m/s.