A car travels at a speed of 80 km/h during the first half of its running time and at 40 km/h during the other half. Find the average speed of the car. (60 km/h) `( AS_(7))`

A man travels a distance of 196 km by train and returns in a car which travels at a speed of 21 km/hours more than the train if the total journey takes 11 hour. Find the average speed of the train and the car respectively.

A train travels 360 km at a uniform speed. If the speed had been 5 km /h more, it would have taken 1 hour less for the same journey. Find the speed of the train.

A car moves with a speed of 40km//h for 15 minutes and then with a speed of 60 km//h for the next 15 minutes. Total distance covered by the car is ?

An aircraft executes a horizontal loop at a speed of 720 km/h with its wings banked at 15^@ . What is the radius of the loop ?

A car covers (1)/(3) part of total distance with a speed of 20 km h^(-1) and second 1 /3 and the last part with a speed of 60 km h^(1) The average speed of the car is:

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?

A train is running at a speed of 72km/h. It crosses a bridge of length half kilometer in 1 min. Calculate the length of the train.

A jet airplane travelling at the speed of 500 km h^(-1) ejects its products of combustion at the speed of 1500 km h–1 relative to the jet plane. What is the speed of the latter with respect to an observer on the ground ?

A car travelling at the speed of 30 km/hr brakes and is brought to halt in 8m.If the same car is travelling at 60 km/hr, then it can be brought to rest with the same breaking power in: