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Vehiculo 2: "b"
a/b =7k/4k
7k - 3k = 120 ⇒ 4k = 120 ⇒ k = 30
Entonces:
Vehiculo 1: 7 (30) ⇒ 210 kg
Vehiculo 2: 3 (30) ⇒ 90 kg