Answer:
The average speed of car is 67 kilometers per hour.
Step-by-step explanation:
Given that:
Distance travelled in one hour = 45 km
Distance travelled in next 2 hours = 78*2 = 156 km
Total distance = 45+156 = 201
Total time = 1+2 = 3 hours
Average speed of the car = [tex]\frac{Total\ distance}{Total\ time}[/tex]
Average speed of the car = [tex]\frac{201}{3}[/tex]
Average speed of the car = 67 km/hr
Hence,
The average speed of car is 67 kilometers per hour.
