To solve this problem, we first need to convert our speed from miles per hour to kilometers per hour since the distance provided is in kilometers. We can do so using the conversion factor, 1 mile = 1.60934 kilometers.
So,
45 miles per hour * 1.60934 = 72.4203 kilometers per hour
This is the speed we will be driving at.
Next, we can determine how long the trip will take by dividing the total distance by our speed.
So,
1440 kilometers / 72.4203 kilometers per hour = 19.8839 hours
This value indicates the time it would take to travel 1440 kilometers at a speed of 72.4203 kilometers per hour.
However, the time is usually rounded to the nearest whole hour for practical reasons. When we do that, 19.8839 hours rounds up to 20 hours.
So, the final answer to our question is: It will take about 20 hours to drive from your current location to Thunder Bay at a speed of 45 miles per hour.
Therefore the correct answer is d. 20 hours.