Question

A small grill can hold two hamburgers at a time. If it takes 10 minutes to cook one side of a hamburger, and 5 minutes to cook the other side, then what is the shortest time needed to cook both sides of three hamburgers?

Answer 1

30 minutes, because since 2 cook at once 15 minutes is spent on the same 2 patties and the other one has 15 minutes to its own.

Answer 2

50 minutes long._______\