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## Homework Statement

A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for 15.0 min at 65.0 km/h, 20.0 min at 75.0 km/h and 60.0 min at 40.0 km/h, and spends 15.0 min eating lunch and buying gas.

Determine the average speed for the trip.

## Homework Equations

Average Speed = total distance/total time

## The Attempt at a Solution

(65+75+80)/(15+20+60+15)=1.64 which isn't logical. I don't understand how to compute the total distance???

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