posted by MeganErin .
A car travels in a straight line with an average velocity of 85 km/h for 2.5 h and then with an average velocity of 30 km/h for 1.5 h.
(a) What is the total displacement for the 4 h trip?
(b) What is the average velocity for the total trip?
I don't even know where to start please help me :) thankk youuuuuu