Problem: a train 100 meters long completely crosses a 300 meters long bridge in 45 seconds . what is the speed of the train is ?
Rationale: "s = ( 100 + 300 ) / 45 = 400 / 45 * 18 / 5 = 32 answer : a"
annotated_formula: divide(divide(add(100, 300), const_1000), divide(45, const_3600))