X can finish a work in 3 days less than that of Y, X alone worked for 4 days and the remaining work was completed by Y. If the whole work took 14 days, in how many days can X and Y alone complete the work ?
A and B together can reap a field in 30 days. After 20 days work, B is called away and A takes 20 days more to complete the work. B alone could do the whole work in