Not Motion Again!

Classical Mechanics Level 3

From the top of a 100 m tower, a ball is dropped and at the same time another ball is projected upwards from the ground with a velocity of 25 m/s. Find when (in seconds) and where the two balls meet (distance measured from the ground in m).

Let the time at which they meet be $t$ seconds and the place where the balls meet be $d$ meters. Find $d + t$

Assumptions and Details

The distance $d$ is measured relative to the ground.
$g = 9.8 ms^{-2}$