On a 120km road, a car travels the first 30km with at a uniform speed of 30km/h. How fast must the car travel for the rest of track so as to have an average speed of 60km/h for the entire journey?

On a 100km track, a train travels the first 30 km at a uniform speed of 30 kmh^(-1) . How fast must the train travel the next 70 km so as to averge the next 40km h^(-1) for entire trip.

A train is moving at a uniform speed of 75 km/hour : How far will it travel in 20 minutes?

A car travels 30 km at a uniform speed of 40 km/h and the next 30 km at a uniform speed of 20 km/h . Find its average speed.

A bus travels a distance of 120km with a speed of 40km/h and returns with a speed of 30km/h .Calculate the average speed for the entire journey.

A car is moving at a uniform speed of 80 km/hr . (i) How far will it travel in 12 minutes ? (ii) How much time will it take to cover a distance of 240 km

A car travels a distance from A to B at a speed of 60 km h^-1 and returns to A at a speed of 30 km h^-1 . The average speed of the car for the whole journey is:

A car travels 20 km in 1 hour and another 40 km in 3 hour. What is the average speed of the car?

A car travels a certain distance with a speed of 50 km//h and returns with a speed of 40 km//h . Calculate the average speed for the whole journey.

In each of the following problems, clearly state what the relevant and irrelevant factors are while going through Steps 1, 2 and 4 given in this chapter :- Suppose a car starts from a place A and travels at a speed of 40 km/h towards another place B. At the same instance, another car starts from B and travels towards A at a speed of 30 km/h. If the distance between A and B is 100 km, after how much time will the cars meet?