Problem: a train 250 m long running at 72 kmph crosses a platform in 50 sec . what is the length of the platform ?
Rationale: "d = 72 * 5 / 18 = 50 = 1000 â € “ 250 = 750 m answer : d"
annotated_formula: subtract(multiply(50, multiply(72, const_0_2778)), 250)