Hello, everyone. I'm new here, drawn by a velocity problem that's had me going in circles for two days. If someone could tell me how to set this up/proceed with solving, that'd be great. "On a car trip, you want to have an average velocity of 90km/h. Over the first half of the trip, you averaged only 48 km/h. What must your velocity be in the second half to obtain an overall average velocity of 90 km/h? Note that the velocities are based on half the distance, not half the time." So far, I've slipped up so many times that I eventually came out with "48 km/h = 48 km/h" Our physics teacher is a nice guy, but he hasn't taught us well enough on dealing with many unknowns for me to be able to solve this without help. Thanks.