A and B together can do a task in 5 days...

A and B together can do a task in 5 days and the total unit of work to be done is 40 units. If A alone can finish the task in 20 days, then how many days B will take to finish the task if he does alone?

`6(2)/(3)` days

`6 (1)/(3)` days

7 days

2 days

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