Administrator. Scenario 5 of 13. Prioritising
Two things by three o'clock
At 11am Helen, a manager, asks you to prepare a set of meeting packs for 3pm. It will take about three hours.
At 11.30am David, another manager, asks you to fix and send out a rota, also by 3pm. That will take about two hours. You cannot finish both in time.
The principle
When you cannot do everything, say so early and let the people who set the deadlines choose. An early warning is nearly always welcome. A late surprise never is.