A and B working together can build a wall, 221 m long, in \(11\frac{1}{9}\) days. If they work on alternate days, with A starting the work, it takes \(22\frac{1}{4}\) days to build the same wall. If A and B work together and build a similar wall but of twice the length and earn a total of Rs. 1800 for it, then B's share of the earnings will be: