If a person travels three equal distances at speeds of 20 km/h, 30 km/h and 10 km/h, then find the average speed of the whole journey.
16.36 km/h
The correct answer is 16.36 km/h.
It is always calculated using the total distance and total time. When time intervals are equal, the average speed is the arithmetic mean of the speeds. When distances are equal, as in this problem, the average speed is the harmonic mean of the speeds. These concepts are important for solving motion problems and understanding the relationship between these key variables.
Similar Questions
A girl walks to the park, situated 450 m from her house, in 4 min and comes back in 6 min. What is the average speed of the girl (in km/h)?
A person completes 80 km of a journey at 10 km/h and the remaining 70 km in 7 hours. His average speed for the whole journey is:
A train runs at a speed of 90 km/h in the first 10 min, 60 km/h in the next 20 min, and 40 km/h in the last 5 minutes. What is the average speed (in km/h) of the train?
A person covers 11 km at a speed of 3 km/h, 21 km at a speed of 5 km/h and 37 km at a speed of 10 km/h. Find the average speed for the entire journey.
A car travels the first 180 km at a speed of 20 km/h. It covers the next 210 km at a speed of 35 km/h. Find the average speed of the car (in km/h).
A person covers 48 km at the speed of 8 km/h, 36 km at the speed of 18 km/h and 16 km at the speed of 8 km/h. What is his average speed in covering the whole distance?
It takes 4 hours to go from Delhi to Chandigarh at an average speed of 60 km/h. How long it will take a person to go from Delhi to Chandigarh at an average speed of 50 km/h?
A person covers 35 km distance at the speed of 45 km/h, and after that he covers 95 km distance at the speed of 105 km/h. What is the average speed during the whole journey?
A person covered 50% of a certain distance at 2 km/h, 25% of the distance at 4 km/h and the remaining distance at 8 km/h. His average speed (in km/h) for the entire journey was:
A train goes from P to Q with an average speed of u km/h and returns from Q to P with an average speed of v km/h. What is its average speed for the entire journey in km/h?
Important Questions from Average Speed
A person covers a certain distance at the speed of 60 kmph and returns to the starting point at a speed of 40 kmph . Find the average speed (in km/hour) of the person for the whole journey.
Kapil travels for 4.5 hours at a speed of 50 km / h and 7.5 hours at a speed of 70 km / h. At the end of it, he finds that he covered only 6/7 of the total distance. At what average speed should he travel so that the remaining distance traveled in 5 hours?
A car has to cover 125 kms in 5 hours. What will be the average speed of the car if it has covered 90 kms in the first 3 hours?
A scooter from P to Q travels at 40 km/h and from Q to P at 30 km/h. What is the average speed of the scooter?
To cover a distance of 144 km in 3.2 hours what should be the average speed of the car in meters/second?
