A car travels a distance of 400 km in 8 hr. Its average speed is:

Q. A car driver travels from the plains to the hill station which are $200$ km apart at an average speed of $40$ km/hr. In the return trip he covers the same distance at an average speed of $20$ km/hr. The average speed of the car over the entire distance of $400$ km is

Q. A car travels first half distance with uniform speed of $60\text{km/hr}$. What should be its uniform speed (in $\text{km/hr}$) for the second half of the distance so that its average speed over the entire journey becomes $90\text{km/hr}$.

Q. A car is travelling at the average speed of $72$ km/hr. How much distance would it travel in $10$ minutes?

Q. A car travels along four sides of a square at speeds of $100,200,300$ and $400$ km/hr. Find average speed.

Q. A car travels first half distance between two places with uniform speed of $60\text{km/hr}$. What should be its uniform speed (in $\text{km/hr}$) for the second half of the distance so that its average speed over the entire journey becomes $90\text{km/hr}$.