Answer:
To find the average speed of each student, we need to divide the distance traveled by the time it took.
For Student 1, the average speed is 1600/20 = 80 m/min.
For Student 2, the average speed is 1330/19 = 70 m/min.
For Student 3, the average speed is 1200/16 = 75 m/min.
For Student 4, the average speed is 1125/15 = 75 m/min.
From the calculations, Student 1 has the greatest average speed of 80 m/min.