Two identical objects, A and B, move along straight, parallel, horizontal tracks. The position – time graph represents the position as a function of time for objects A and B.
a) At approximately which time or times, if any, are the objects moving at the same speed? If the objects are never moving at the same speed during the time interval shown, indicate this directly. Briefly explain your answer.
(b) Describe what is happening to the positions of objects A and B between 3 s and 4 s.

I would appreciate some help with this, thank you!