Answer:
0mph
Explanation:
Velocity unless speed is a vector, this means that it also has direction, usually indicated by the sign in a two dimensional line with an starting point that indicates 0. Here moving to the right (east) has a positive direction, and we are indicated that the first distance traveled was +60mph*1,5h=+90miles, then turns around and goes back to the left(west) -45mph*2h=-90miles, then the total distance traveled was 0miles during 3,5hours, then the average speed is 0mi/3,5h=0mph.
