A and B working separately can so a 15 days respectively. If they work on alternate days begining with A , in how many days will the work be completed ?

A and B working separately can so a 15 days respectively. If they work on alternate days begining with A , in how many days will the work be completed ?
1). 18 days
2). 13 days
3). 12 days
4). 6 days

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