Find the Magnitude of Average velocity using the given vectors

[aatari]

Homework Statement

The drone flies in a straight line, and records how much time it took. Each new motion is relative to the present position. Meaning, a motion of (5i,0j,0k) followed by ( 5i,0j,0k) moves a distance of 10m. The following inputs were given, with their corresponding times in flight:

(3 i, -2 j, 5 z) --- 4s
(-15 i, 20 j, -18 z) --- 6s
(25 i, 24 j, -23 z) --- 10s

What was the magnitude of the average velocity during the entire flight?

Relevant Equations

Average Velocity = Magnitude of R/Total Time

Hi Guys I've attempted the question but not sure if the approach I used is correct. Would someone please have a look at my solution and let me know if it makes sense.
Thanks!

 

[TSny]

Looks good to me

 

[aatari]

Looks good to me

Ok Thank You!