Atwo dimensional shape is formed by the intersection of the cone and a plane perpendicular to its base and passing through its vertex. what is the two dimensional shape?

Randy and trey take turns cleaning offices on the weekends. it takes randy at most 4 hours to clean the offices. it takes trey at most 6 hours to clean the offices. what is the greatest amount of time it would take them to clean the offices together? 2.4 hours 2.5 hours