Problem: a train 300 m long , running with a speed of 54 km / hr will pass a tree in ?
Rationale: "speed = 54 * 5 / 18 = 15 m / sec time taken = 300 * 1 / 15 = 20 sec answer : c"
annotated_formula: multiply(divide(300, multiply(54, const_1000)), const_3600)