Derek and Robinson are standing 78ft away from each other warming up and tossing a ball at each other. Suppose both toss a ball at the same time. Robinsons height 5ft and Dereks 6ft. Robinsons initial velocity is 45ft/sec at an angle of 44 degrees from the horizontal and Dereks initial velocity is 41ft/sec at an angle of 39 degrees from the horizontal. Find the minimum distance between the two balls and when the minimum distance occurs.