Question

am object travels 15 m in and then another 10m in 2s .what is the average speed of the object?

Answer 1

This should be the question:
“An object travels 15 m in 3s and then another 10m in 2s .what is the average speed of the object?”

Average speed = Total distance / Total Time
= (15 m + 10 m) / (3s + 2s)
= 5 m/s

Average speed of object is 5 m/s

Answer 2

A correction in your question " A object travels 15 m in 3 seconds and another 10m in 2s .what is the average speed of the object?

So average speed = total distance/ total time

= 15+10 /5 m/s

=5 m/s.

Hence average speed = 5 m/s