a and b together can do a work in 3 days . if a alone can do it in 12 days . in how many days can b alone do it ?
"a 4 1 / 3 â € “ 1 / 12 = 1 / 4 = > 4"
add(inverse(subtract(divide(const_1, 3), divide(const_1, 12))), divide(const_2, add(const_2, const_3)))