Problem: a train running at the speed of 40 km / hr crosses a pole in 9 sec . what is the length of the train ?
Rationale: "speed = 40 * 5 / 18 = 100 / 9 m / sec length of the train = speed * time = 100 / 9 * 9 = 100 m answer : a"
annotated_formula: multiply(divide(multiply(40, const_1000), const_3600), 9)