First collision

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

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