A does half as much work as B is one sixth of the time. If together they take 10 days to complete a work, how much time shall A alone take to do it?

A does half as much work as B is one sixth of the time. If together they take 10 days to complete a work, how much time shall A alone take to do it?
1). 70 days
2). 30 days
3). 14 days
4). 50 days

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