a person travels equal distances with speeds of 3 km / hr , 4 km / hr and 5 km / hr and takes a total time of 47 minutes . the total distance ( in km ) is :
"sol . let the total distance be 3 x km . then , x / 3 + x / 4 + x / 5 = 47 / 60 ⇔ 47 x / 60 = 47 / 60 ⇔ x = 1 . ∴ total distance = ( 3 * 1 ) km = 3 km . answer c"
multiply(multiply(divide(divide(47, const_60), add(add(divide(const_1, 3), divide(const_1, 4)), divide(const_1, 5))), const_3), const_1000)