Question

a body cover certain distance with a speed of 30 kmph and returns the same distance with a speed of 40 kmph. Find the average speed​

Answer 1

Explanation:

Distance is same.

So, average speed is calculated by the formula, av_s = 2V1V2 / V1 + V2

av_s = 2*30*40/ 30+40

av_s = 2400/70

av_s = 34.28 km/h

Answer 2

Answer:

average speed = total distance/total time taken

Explanation:

let the distance be n

so time taken is

n/30+n/40

and total distance is 2N

then average speed is

total distance/total time taken

2N / N/30+N/40

calculate and get your answer

hope this HELPS