two trains each 150 m in length are running on the same parallel lines in opposite directions with the speed of 80 kmph and 70 kmph respectively . in what time will they cross each other completely ?
"d = 150 m + 150 m = 300 m rs = 80 + 70 = 150 * 5 / 18 = 125 / 3 t = 300 * 3 / 125 = 7.2 sec answer : b"
divide(150, multiply(80, const_0_2778))