Which act (A or B) would a person using classical utilitaria…

Which act (A or B) would a person using classical utilitarian theory probably choose in the scenario below? (To keep things simple, assume here that this classical utilitarian is also using an act-utilitarian approach.)  Imagine a scientist (with the correct formula for a cure for cancer in his head) and a non-scientist who survive on a raft (after a shipwreck). In 30 days the raft will drift within shipping lanes (and thus a ship is likely to spot them at that point). Since there’s only enough food for 1 of them for 30 days, they can either do Act A (flip a coin as the totally fair thing to do and whoever wins, gets all the food) or Act B (give the scientist the food so he can survive and can return to civilization and get to a lab and produce the cure for cancer).