a train speeds past a pole in 25 seconds and a platform 500 m long in 35 seconds . its length is :
"let the length of the train be x meters and its speed be y m / sec . they , x / y = 25 = > y = x / 25 x + 500 / 35 = x / 25 x = 1250 m . answer : option e"
multiply(500, subtract(const_2, const_1))