Problem: two cars are traveling in the same direction along the same route . the red car travels at a constant speed of 20 miles per hour , and the black car is traveling at a constant speed of 50 miles per hour . if the red car is 20 miles ahead of the black car , how many hours will it take the black car to overtake the red car ?
Rationale: "option b 20 + 20 t = 50 t t = 0.6"
annotated_formula: divide(20, subtract(50, 20))