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## Homework Statement

If you drive from Physicsland to Chemistryland at a constant speed of 120 km/h and immediately return at a constant speed of 60.0 km/h, what is your average speed?

## Homework Equations

## The Attempt at a Solution

Somebody helped me out on this question and we used a weighted average.

(120 x 1/3) + (60 x 2/3) = 8.0 x 10^1 km/h

The answer is correct, but I don't understand how this weighted averaging works.

It would be great if you could help me understand!