A trains from rest at station A and it took 150 seconds to reach station B. The speed-time curve of the motion is given below. Find the a) distance of the railway track connecting the stations and b) the acceleration of the train within the time interval 20-80 seconds.
Extracted text: 아 840 13 60 80 Time, sec. 20 40 100 120 150 Speed, mi. per hour