Answer:

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Step-by-step explanation:

The average velocity of the body can be calculated by dividing the total displacement by the total time taken.

The total displacement of the body is the difference between the final position and the initial position.

To calculate the average velocity of the body:

- Convert the time for 250 km from minutes to seconds: 19 minutes = 19 x 60 = 1140 seconds

- Total distance travelled = 20 km + 250 km = 270 km

- Total time taken = 5 seconds + 1140 seconds = 1145 seconds

- Average velocity = Total displacement / Total time taken

- Total displacement = 250 km - 20 km = 230 km

- Average velocity = 230 km / 1145 seconds = 0.2 km/s

Therefore, the average velocity of the body is 0.2 km/s.