<prompt> Calculate the estimated time it would take to reach a destination driving at a speed of 80 miles per hour.Distance: 400 miles  <response>: If you are driving at a constant speed of 80 miles per hour, it would take approximately 5 hours to reach a destination that is 400 miles away. This is calculated by dividing the total distance 400 miles by the speed 80 miles per hour 40080 5 hours. 