To complete a work , A takes 50% more time than B. If together they take 18 days to complete the work, how much time shall B take to do it ?

To complete a work , A takes 50% more time than B. If together they take 18 days to complete the work, how much time shall B take to do it ?
1). 30 days
2). 35 days
3). 40 days
4). 45 days

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