A record of travel along a straight path is as follows:

1. Start from rest with constant acceleration of 2.40 m/s2 for 14.0 s.
2. Maintain a constant velocity for the next 2.85 min.
3. Apply a constant negative acceleration of −8.39 m/s2 for 4.00 s.
(a) What was the total displacement for the trip?
_______m

(b) What were the average speeds for legs 1, 2, and 3 of the trip, as well as for the complete trip?
leg 1. ________ m/s
leg 2. ________ m/s
leg 3. ________ m/s
complete trip ________ m/s

I really need help with this question. I keep getting it wrong and im struggling with it.