The answer is 15 servings
The average speed is the ratio between the distance covered, and the time elapsed to cover that distance.
The total distance is the sum of the three distances covered:

Similarly, the total time elapsed is

So, althought you didn't always travelled with the same speed, you globally covered 170km in 1.75 hours. This leads to an average speed of

Answer:
Following given solution will help you!
The answer is 7, hope this helps!! just plug in 2 for the x and type the answer in :)