Kinematics' equations

Three cars leave \(A\) for \(B\) in equal time intervals. They reach \(B\) simultaneously and then leave for point \(C\) which is \(120 \text{ km}\) from \(B\). The first car arrived there ( at \(C\)) an hour after the second car, and third car, having reached \(C\), immediately reverses the direction and \(40\text{ km}\) form \(C\) meets the first car. Find the speed of the first car (in \( \text{km/hr} \)).

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