1. The problem statement, all variables and given/known data You ride your bike for 1.5h @ avg velocity of 10km/h, then for 30min @ 15km/h What is you average velocity? So I think that the variables are this Vf=15km/h(.000004m/s) Vi=10km/h(.000003m/s) Tf=90m(5400s) Tf=30m(1800s) 2. Relevant equations That's what I'm asking -_- I think that it is Code (Text): V[sub]avg[/sub] = d[sub]f[/sub] - d[sub]i[/sub] ------ t[sub]f[/sub] - t[sub]i[/sub] 3. The attempt at a solution everything I try I get gross decimal numbers -_- Isn't there an easier way???