a work as fast as b . if b can complete a work in 8 days independently , the number of days in which a and b can together finish the work in ?
"ratio of rates of working of a and b = 2 : 1 ratio of times taken = 1 : 2 a ' s 1 day work = 1 / 4 b ' s 1 day work = 1 / 8 a + b 1 day work = 1 / 4 + 1 / 8 = 3 / 8 = > 8 / 3 = 2 2 / 3 a and b can finish the work in 2 2 / 3 days answer is b"
inverse(add(inverse(8), multiply(const_2, inverse(8))))