Ravi does half as much work as Rahim in four-fifth of the time. If together they take 40 days to complete the work, how much time shall Ravi take to do it?

Ravi does half as much work as Rahim in four-fifth of the time. If together they take 40 days to complete the work, how much time shall Ravi take to do it?

1). 104 days
2). 110 days
3). 102 days
4). 106 days

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