A particle covers half of its total distance with speed

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A particle covers half of its total distance with speed v₁ and the rest half distance with speed v₂. Its average speed during the complete journey is

1. v₁v₂
  v₁ + v₂
2. 2v₁v₂
  v₁ + v₂
3. 2v₁²v₂²
  v₁² + v₂²
4. v₁ + v₂
  2

Correct Option: B

Let the total distance covered by the particle be 2s. Then