How do differences in air pressure affect the air around us?

An airplane flies eastward and always accelerates at a constant rate. at one position along its path it has a velocity of 34.3 m/s, it then flies a further distance of 40100 m and afterwards its velocity is 47.5 m/s. find the airplane\'s acceleration and calculate how much time elapses while the airplane covers those 40100 m.

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

I’ve been stuck on this for a while