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