HELP WITH FORMULA IF, AND

Donald_Genes_ Thanks for getting back to me on this. My formula skills are sub par but I am working on it. I did try yours, however it's not generating the final outcome I am hoping for yet. In the screenshot you will see that Column K is for OT(overtime - anything above 40 hours) but only after you take the total from Column F and subtract the STANDBY hours (column I) and the standard 40 (hours in a work week). Then if the final number is less than 0 it should generate 0 and over 0 should have how ever many hours of OT they will receive. See screenshot:

Thank you in advance for any guidance on this.

Donald_Genes_ 

THANK YOU! I had it in there earlier and tried it out for what I needed and I made an adjustment, but for some reason its not populating what i need again. The K (OT) column should be F-I-40. And then if its over 0 then generate that amount and under 0 then read 0. 

Think you can give me one more shot on this??