SOLUTION: A teacher drove halfway from Point A to Point B at 120 km/h and the rest of the way at 90km/h. What was his average speed for the whole trip?

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Question 657820: A teacher drove halfway from Point A to Point B at 120 km/h and the rest of the way at 90km/h. What was his average speed for the whole trip?
Answer by pv=nrt15rcks(23) About Me  (Show Source):
You can put this solution on YOUR website!
The two distances traveled are equal, so you can just treat it as two different trips. Add the two speeds together to get 210km/h. Now, divide by 2 to get the average of 105km/h.