a train crosses a platform of 250 m in 20 sec , same train crosses another platform of length 640 m in 40 sec . then find the length of the train ?
"length of the train be ‘ x ’ x + 250 / 20 = x + 640 / 40 2 x + 500 = x + 640 x = 140 m answer : d"
subtract(multiply(640, divide(20, divide(20, const_3))), multiply(250, divide(40, divide(20, const_3))))