Problem: how long does a train 100 m long travelling at 60 kmph takes to cross a bridge of 120 m in length ?
Rationale: "b 13.2 sec d = 100 + 120 = 220 m s = 60 * 5 / 18 = 50 / 3 t = 220 * 3 / 50 = 13.2 sec answer is b"
annotated_formula: divide(add(100, 120), multiply(60, const_0_2778))