According to the given data we have the following:
running pace is 3.75 mph
going to run at least 1.5 miles
Therefore, to calculate the amount of hours will the person have to run we would make the following calculation:
amount of hours will the person have to run=1.5/3.75 mph
amount of hours will the person have to run=0.4
Therefore, the amount of hours the person will have to run will be 0.4 hours