a train speeds past a pole in 23 seconds and a platform 125 m long in 33 seconds . its length is ?
"let the length of the train be x meters and its speed be y m / sec . they , x / y = 23 = > y = x / 23 x + 125 / 33 = x / 23 x = 287.5 m . answer : b"
multiply(125, subtract(const_2, const_1))