A car moving on a straight road covers one third of the distance with a speed of 20 km/hr and the rest with the speed of 60km/hr . The average speed of car is (1)40 km /hr (2)50 km/hr (3)36km/hr (4)55km/hr

Q. A car travels the first one third of a certain distance with a speed of 10 km/hr, the next one third with a speed of 20 km/hr and the last one third distance with a speed of 60 km/hr The average speed of the car for the whole journey is

Q. A car covers half of the distance with speed $60km/hr$ and rest of the half with speed $30km/hr$ . The average speed of the car is -

Q. A car covers $4$ successive $3$ km stretches at speeds of $10$ km/hr, $20$ km/hr, $30$ km/hr and $60$ km/hr respectively. The average speed of the car for the entire journey is