$\text { Two cars start their journey from the same point at a velocity of } 1 \mathrm{~km} / \text { hour and } 2 \mathrm{~km} / \mathrm{hour} \text {, respectively. If }$ $\text { the angle between their travel paths is } 60^{\circ} \text { then what is their distance after } 2 \text { hour? }$

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