A bus travels the first half of a certain distance at speed

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A bus travels the first half of a certain distance at speed v1 and the second half at speed v2. The average speed during the entire journey is:

[UPPSC 2024]

A Suppose, the total distance is D.

B First half of the distance D/2 is fixed in the first half.

C Distance D/2 in the second half is fixed from V2.

D Now, to take time out: