Eating before or after?

Hi...i have a stupid kuestion..ill try to explain as best as i kan..i walk for an hour every single day. and its been hot out..so ive been losing weight. well i work in the afternoons so i have free time in the mornings to walk. howerver long i want. on monday me and my friend are goin out to dinner after i get off from work which is like 530. i kno its best to eat right after you excercise kuz your metabolizm is still goin..but im worried bekuz. after i walk i gotta go straight to work and my metabolism is gonna slow down. and then im gonna eat after work in the evening. i feel like im gonna gain weight from what i eat..even tho i walked..is this tru..kan someone help me out?? please let me know if i wasnt specifik enough..thanks