Where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time. Find v when a is 4 m/s squared, u is 3 m/s, and t is 72 seconds

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