Ram covers a distance of 100 km with variable speed. During the first half of his journey his speed was 20 km/h and during the rest of his journey his speed was 40 km/h. Calculate the average speed of Ram during the whole course of his motion.

Ram covers a distance of 100 km with variable speed. During the first

1.	Ram covers a distance of 100 km with variable speed. During the first half of his journey his speed was 20 km/h and during the rest of his journey his speed was 40 km/h. Calculate the average speed of Ram during the whole course of his motion.
Answer» `"Distance covered = 100 km"` `"Time taken by Ram to cover 50 km with speed 20 km/h "(t_(1))=(50)/(20)h=(5)/(2)h` `"Time taken by Ram to cover next 50 km "(t_(1))=(50)/(40)g=(5)/(4)h` `"Total time"=t_(1)+t_(2)=(5)/(2)+(5)/(4)=(10+5)/(4)=(15)/(4)h` `"Average speed"=("Total distance travelled")/("Total time taken to cover that distance")` `=(100)/(15)xx4=(80)/(3)=26.66km//h`

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Ram covers a distance of 100 km with variable speed. During the first half of his journey his speed was 20 km/h and during the rest of his journey his speed was 40 km/h. Calculate the average speed of Ram during the whole course of his motion.

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