A jogger runs in a straight line with an average velocity of 5m/s for 4 min, and then with an average velocity of 4m/s for 3 min. (a) what is her total displacement? (b) what is her average velocity during this time?

Use that formula, then add the two values for displacement you get.



And be sure that you are using the correct units. Velocity is seconds, convert every time into seconds.