Answer:

To find the average speed of the car, we can use the formula:

average speed = total distance ÷ total time

We know that the car traveled 110 km in 2 hours. So, the average speed is:

average speed = 110 km ÷ 2 hours

average speed = 55 km/hour

Therefore, the car's average speed is 55 km/hour.

Let's first find out how much 30 notebooks cost before the discount. We know that each notebook costs n pesos, so 30 notebooks will cost:

30n pesos

Now, we need to subtract the P50 discount from this amount. So, the total cost of the notebooks after the discount will be:

30n - P50 pesos

Therefore, the mother spent 30n - P50 pesos for the 30 notebooks.