a train speeds past a pole in 11 seconds and a platform 120 m long in 22 seconds . its length is ?
let the length of the train be x meters and its speed be y m / sec . they , x / y = 11 = > y = x / 11 x + 120 / 22 = x / 11 x = 120 m . answer : d
multiply(120, subtract(const_2, const_1))