A and B can do a plece of work in 28 and 35 days respectively. They began to work together but A leave after sometime and B completed remaining work in 17 days. After how many days did A leave ?

A and B can do a plece of work in 28 and 35 days respectively. They began to work together but A leave after sometime and B completed remaining work in 17 days. After how many days did A leave ?
1). $14\frac{2}{5}$ days
2). 9 days
3). 8 days
4). $7\frac{5}{9}$ days

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