A person travels by car from one city to another with different constant speeds betwe

A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for 30.0 min at 80.0 km/h, 12.0 min at 100 km/h, and 45.0 min at 40.0 km/h and spends 15.0 min eating lunch and buying gas. (a) Determine the average speed for the trip. (b) Determine the distance between the initial and final cities along the route.

I try to solve

(a) Averge speed = total distance / total time

= 30 + 12 + 45 + 15 / 80.0 + 100 + 40.0 = 0.1673 km/h

(b) The distance

= 80 + 100 + 40 = 220 km

please I wan t to correct my answer .