I need help with this question. I want this to be simplifed

Passengers usually start to board their flights 1 hour before the scheduled take off time. the gate will be closed 15 minutes before the takeoff time. jack’s plane is scheduled to take off at 12: 05 a.m. if he arrives at the gate at 11: 45 p.m., can he board the flight?

Find the surface area of the prism formed by the net

How do you use the elimination method for this question? explain, because i really want to understand!