Photons

Two beams of light with different wavelengths (A > B) are used to produce photoelectrons from a given metal surface.

(b) Find Kmax for cesium (W0 = 1.9 eV) if A = 570 nm, and B = 330 nm.
Kmax, A
___ eV
Kmax, B
___ eV

I've tried using the KEmax equation where Kmax = hf - W0, but I got the wrongs answers.  I don't know what I am doing wrong.