Hi guys, I just started taking physics 2 days ago at my school. One of our questions is: "You drive a car 2.0 hours at 40km/h, then 2.0 hours at 60 km/h What is your average velocity?" Ok, from what I understand, Average Velocity is: delta v = delta distance / delta time So, To find delta distance, I need to subtract 120 - 80 since 2 hours at 40 km/h is 80 and 2 hours at 60 km/h is 120. And to get delta time, I'd have to subtract two from two... leaving zero. Well since you can't divide by zero, I'm stuck from here. I've looked at some sites online, but it's not helping me. Can someone help me out here? I'm guessing it's 50km/h from regular average, but I want to make sure. Thanks in advance!