Problem: a train 250 m long running at 72 kmph crosses a platform in 30 sec . what is the length of the platform ?
Rationale: "d = 72 * 5 / 18 = 30 = 600 â € “ 250 = 350 m answer : a"
annotated_formula: subtract(multiply(30, multiply(72, const_0_2778)), 250)