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## Homework Statement

Sally travels by car from one city to another. She drives for 30.0 min at 52.0 km/h, 35.0 min at 48.0 km/h, and 23.0 min at 50.0 km/h, and she spends 10.0 min eating lunch and buying gas.

## Homework Equations

avg. speed= distance traveled / time of travel

## The Attempt at a Solution

first, I added all three speeds (52+48+50) and divided by 3. I got 50 as the average speed, but the website says I'm incorrect.

How can I find the average speed without the distance traveled?

avg. speed = distance traveled / (30+35+23)

avg. speed = distance traveled / 88