IF anyone can help with this physics problem, I will owe you big time

I tried this problem with someone else and they couldn't figure it out either.

The answer is :.310m

"A flowerpot falls off a windowsill and falls past the window below. You may ignore air resistance. It takes .420s to pass this window, which is 1.90 m high. How far is the top of the window below the windowsill from which the flowerpot fell?"

I tried, x=x0+v0(t)+1/2(a)(t)^2. v=v0+at

...

Its some simple problem which is a PITA. I have the answer I just can't find a way to get to it.

THanks anyone