A car travels from A to B at a speed of 20 kmph and returns at a speed of 30 kmph. The average speed of the car for the whole journey is :

A car travels a distance AB at a speed of 40 km/hr and returns to A at a speed of 30 km/hr. What is the average speed for the whole journey?

A man travels at a speed of 20 Km/hr. and then returns at a speed of 30 Km/hr. His average speed of whole journey is

A car travels the first half of a distance between two places a speed of 30 km/hr and the second half of the distance a 50 km/hr. The average speed of the car for the whole journey is

A car is moving on a straight road covers one third of the distance with a speed of 30 km/h and the rest with a speed of 50 km/h. The average speed of the car is

A car is moving on a straight road covers one third of the distance with a speed of 20 km/h and the rest with a speed of 60 km/h. The average speed of the car is

A boy goes from his house to school by bus at a speed of 20 km h^(-1) and returns back through the same route at a speed of 30 km h^(-1) . The average speed of his journey is :

A car covers first half of total distance at speed of 50 km/h and other half at the rate of 80 km/h. The average speed of car would be

A motor vehicle travelled the first third of a distance s at a speed of v_1 =10 kmph, the second third at a speed of v_2 =20 kmph and the last third at a speed of v_3 =60 kmph. Determine the mean speed of the vehicle over the entire distance s.

A motorcyclist drives from A to B with a uniform speed of 30 km h^(-1) and returns back with a speed of 20 kmh^(-1) . Find its average speed.

A car moves a distance of 100 m. It coveres first half with speed of 10 m/s and another half with speed of v m/s. If the average speed of car is 18 m/s, then value of v is