Robert leaves home on a motorcycle and travels towards his aunt’s house at an average speed of 75 kilometers per hour (kph or km/h). While on the road, the motorcycle breaks down and he decides to walk the rest of the way to his aunt at an average speed of 5 kph. If he reaches her aunt’s house after 1 hour and 20 minutes and the distance from his home to his aunt’s house is 30 kilometers, how far has he gone before the motorcycle breaks down?