Final answer:
Without the function f(x), we cannot compute f(1.5). However, using the 40 km distance and 80 km/h speed, the student took 0.5 hours to drive home. To calculate the driving time for a certain distance, a proportion with the distance and speed should be set up.
Step-by-step explanation:
The student's question asks to calculate f(1.5), which refers to the value of a function f at 1.5. Since it is a math problem, we assume f(x) is the function of interest. However, the function itself is not provided in the question, so we cannot calculate f(1.5) directly. Instead, let's tackle the question about driving time and distance based on the given background information. The student drove 40 kilometers at a steady speed of 80 kilometers/hour. To find the time taken, we divide the distance by the speed.
Time = Distance / Speed = 40 km / 80 km/hour = 0.5 hours. Therefore, the student took half an hour to drive home. If we want to see how many hours Arby and Charlie will be a certain number of miles from home, we need to set up a proportion using the distance they are from home and their speed. Since miles are mentioned, we need to convert kilometers to miles if necessary before calculating.