I work in a relatively stressful, pressured job in an office. My contracted working hours are 9-5 but everyone starts early or works late (or both) pretty much every day. That's fine, that's the nature of the job.
I've just discovered a new recruit is working 4 days, 8-5 and being paid for those hours. So she's getting paid for the overtime that the rest of us do for free.
AIBU to be annoyed by this? I know you're all going to say that I should ask for the same thing but how to do so without sounding petty?