First collision

There are two objects \(A\) (\( 15 \text{ m} \) above ground) and \(B\) (\( 10 \text{ m} \) above ground) on a straight line perpendicular to the ground. \(A\) is thrown straight downward with a speed of \( 10 \text{ m/s} \) and, at the same time, \(B\) starts to fall freely. Find the time that passes until their first collision.

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