When will both of the balls be at the same height?

[diaox3]

Homework Statement

http://img228.imageshack.us/img228/7232/physicsku0.jpg
http://g.imageshack.us/img228/physicsku0.jpg/1/

Homework Equations

The Attempt at a Solution

I'm extremely lost..

 

[danago]

What have you tried so far? What will be the height of each ball at any instant in time?

 

[diaox3]

I calculated how much time it would take for each ball to cover that distance.

Gravity ball - 1.53 seconds
Ball being shot up - .6 seconds


I just need to know at what time both of them are at the same height.