S₁ = S₂ = S
v₁ * t₁ = v₂ * t₂ => v₂ / v₁ = t₁ / t₂ = 20 мин / 10 мин = 2
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S₁ = S₂ = S
v₁ * t₁ = v₂ * t₂ => v₂ / v₁ = t₁ / t₂ = 20 мин / 10 мин = 2