The change in velocity = -10 - -2 = 8 m/s
The time was 4 seconds.
Acceleration = 8 m/s / 4 s = 2 m/s^2
Just add 25 minutes. That's because they boarded at 3:55 and took 25 minutes to just go to the fair. So in 25 more minutes they got to the fair! so it would be 4:20 when they got to the fair.