a person travels equal distances with speeds of 9 km / hr , 10 km / hr and 11 km / hr and takes a total time of 47 minutes . the total distance is ?
"let the total distance be 3 x km . then , x / 9 + x / 10 + x / 11 = 47 / 60 29 x / 96 = 47 / 60 = > x = 2.59 total distance = 3 * 2.59 = 7.78 km . answer : c"
multiply(multiply(divide(divide(47, const_60), add(add(divide(const_1, 9), divide(const_1, 10)), divide(const_1, 11))), const_3), const_1000)