One-third of a certain journey was covered at the speed of 20 km/hr, one –fourth at 30 km/hr and the rest at the speed of 50 km/hr. find the average speed peer hour for the whole journey.

One-third of a certain journey was covered at the speed of 20km/hr ,one - fourth at 30km/hr and the rest at the speed of 50km/hr .find the average speed peer hour for the whole journey.

One-fourth of a certain journey is covered at the rate of 25 km/h, one-third at the rate of 30 km/h and the rest at 50 km/h. Find the average speed for the whole journey.

In a journey, the first one - third of the distance is covered at a speed of 20km/hr, the second 1/3 at speed of 30 km/hrand the last 1/3 at a speed of 24 km/hr. The average speed in km/hr for the whole journey is

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 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