A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it takes for the ball to fall halfway to the ground is 1.2s. Find the time it takes for the ball to fall from rest all the way to the ground.

??? HUH? The answer is 1.7 s, but I have no clue on this one??

HELP HELP

Vo = 0 m.s

a = 9.8 m.s.s

t 1/2 way is 1.2s.

I can't see what formula to give me ANY Other info???