A car travels at 54 km/hr for first 20 secs , 36 km/hr for next 30 secs and finally 18 km/hr for next 10 secs. Find its average speed.
A car starts from Bangalore to Mumbai and returns in 20 hours. What is the average velocity and average speed of the car if the odometer reading of the car when it started was 2200 km and when it finished was 3800 km?
If a car travels first 40km at speed of 20km/h and next 80km at a speed of 40km/h. What is the average speed of car for entire journey?