Final answer:
The percentage change from 60 km/h to 45 km/h is 25%.
Step-by-step explanation:
To find the percentage change from the first quantity to the second quantity, you can use the formula:
Percentage Change = (Change in Quantity / Initial Quantity) x 100%
In this case, the initial quantity is 60 km/h and the final quantity is 45 km/h. Therefore, the change in quantity is 60 km/h - 45 km/h = 15 km/h.
Plugging these values into the formula:
Percentage Change = (15 km/h / 60 km/h) x 100% = 25%
So, the percentage change from 60 km/h to 45 km/h is 25%.