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‘A’ alone can complete a work in 40 hours. ‘A’ started the work alone and left after working on it for 20 hours. If ‘B’ completed the rest of the work in 20 hours then find the time taken by ‘A’ and ‘B’ together to complete the whole work.

A 32 hours

B 20 hours

C 30 hours

D 25 hours

E None of these

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