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Verified answer
Gelombang BunyiBunyi 1 :
t₁ = 2s₁ / v₁
t₁ = 2(60) / (300) = 0,4 s
Bunyi 2 :
t₂ = 2s₂ / v₂
t₂ = 2(90) / 300 = 0,6 s
Interval = 0,6 - 0,4 = 0,2 s [D]