so a guy start running from his house on flat road, of which he ran on a speed of 8 miles/h, then he climbed a hill at the speed of 6 miles/h and descend at 12 miles/h.
(all 3 parts doesn't have to be same in length)
then after descending the guy saws his friend and immediately runs back along the same route and back to his house, the total time is 45 min, so how long was the distance between the house and his friend?