two passenger trains start at the same hour in the day from two different stations and move towards each other at the rate of 15 kmph and 21 kmph respectively . when they meet , it is found that one train has traveled 60 km more than the other one . the distance between the two stations is ?
"1 h - - - - - 5 ? - - - - - - 60 12 h rs = 15 + 21 = 36 t = 12 d = 36 * 12 = 432 answer : a"
add(multiply(divide(60, subtract(21, 15)), 15), multiply(divide(60, subtract(21, 15)), 21))