Determine the object's average velocity over the time interval from 2 to 4 seconds

Determine the object’s average velocity over the time interval from 2 to 4 seconds.
Express your answer in meters per second to the nearest integer.
Position versus time graph for an object traveling with a non-constant velocity. The time is in seconds on the horizontal axis and position in meters is given on the vertical axis.

The following are approximate coordinate points on the curve: (1, 5), (2, 10), (3, 15), (4, 20), (5, 30), (6, 40) the line is a cruve