Answer:

To find the average speed of the boy we can use the formula:

Average Speed = Total Distance / Total Time

In this case the total distance covered by the boy is 2.5 km + 3 km = 5.5 km.

The total time taken by the boy is 15 minutes + 18 minutes = 33 minutes.

Now we need to convert the time to hours since the speed is usually measured in km/h. There are 60 minutes in an hour so:

Total Time = 33 minutes / 60 = 0.55 hours

Now we can calculate the average speed:

Average Speed = 5.5 km / 0.55 hours = 10 km/h

Therefore the average speed of the boy is 10 km/h.

Explanation:

10km per hour it is the normal speed