Cars a and b are traveling from town x to town y on the same route at constant speeds. car a is initially behind car b, and car a’s speed is 1.25 times car b’s speed. car a passes car b at 1: 30 pm. at 3: 15 pm, car a reaches town y, and at that moment, car b is still 35 miles away from town y. what is the speed of car a?
(a) 60 mph
(b) 75 mph
(c) 80 mph
(d) 96 mph
(e) 100 mph