Physics

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A red ball is thrown down with an initial speed of 1.2 m/s from a height of 25 meters above the ground. Then, 0.6 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 22.9 m/s, from a height of 0.8 meters above the ground. The force of gravity due to the earth results in the balls each having a constant downward acceleration of 9.81 m/s2.
I need help on this one..
do i set heights equal?
If so..what equation do i use? Thank You
How long after the red ball is thrown are the two balls in the air at the same height?

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