a can do a work in 3 days . b can do in 6 days . if both a & b are working together in how many days they can finish the work ?
"1 day work of a = 1 / 3 1 day work of b = 1 / 6 1 day work of a & b = 1 / 3 + 1 / 6 = 1 / 2 a & b finish the work in 2 days answer is c"
divide(const_1, add(divide(const_1, 3), divide(const_1, 6)))