a train crosses a platform of 120 m in 15 sec , same train crosses another platform of length 250 m in 20 sec . then find the length of the train ?
"length of the train be ‘ x ’ x + 120 / 15 = x + 250 / 20 4 x + 480 = 3 x + 750 x = 270 m answer : b"
subtract(multiply(250, divide(15, divide(15, const_3))), multiply(120, divide(20, divide(15, const_3))))