To estimate his travel time, joe divides the distance, d, in miles by 5 less than his expected average speed, in miles per hour. if joe plans on driving 75 miles per hour and he has to travel 310 miles, how long does he expect to be traveling? round to the nearest tenth when necessary.

Distance is equal to rate times time, and time is the unknown in this instance. To find time, divide distance by rate. In this case, Joe wants to use a rate five miles per hour less than his planned speed of 75 miles per hour, which is 70. Dividing 310 miles by 70 miles per hour yields an expected travel time of 4.4 hours.