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A car moving on straight road covers one third of a certain distance with 20km/h and rest with 60km/h. The average speed is-?
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A car moving on straight road covers one third of a certain distance w...
Calculation of Average Speed

To calculate the average speed of the car, we need to use the formula:

Average speed = Total Distance / Total Time

Calculation of Total Distance

Let's assume that the total distance that the car covers is 'd'. According to the problem, the car covers one-third of the distance with a speed of 20 km/h and the rest of the distance with a speed of 60 km/h.

Distance covered at 20 km/h = d/3
Distance covered at 60 km/h = 2d/3

Total distance covered = d/3 + 2d/3 = d

Therefore, the total distance covered by the car is 'd'.

Calculation of Total Time

To calculate the total time taken by the car, we need to use the formula:

Time = Distance / Speed

Time taken to cover d/3 distance at 20 km/h = (d/3) / 20 = d/60 hours
Time taken to cover 2d/3 distance at 60 km/h = (2d/3) / 60 = d/90 hours

Total time taken = (d/60) + (d/90) = 3d/180 + 2d/180 = 5d/180 = d/36 hours

Therefore, the total time taken by the car is 'd/36' hours.

Calculation of Average Speed

Average speed = Total Distance / Total Time
Average speed = d / (d/36)
Average speed = 36 km/h

Therefore, the average speed of the car is 36 km/h.
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A car moving on straight road covers one third of a certain distance w...
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A car moving on straight road covers one third of a certain distance with 20km/h and rest with 60km/h. The average speed is-?
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