A and B completed a work together in 5 days. Had A worked at twice his own speed

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โœช Choose the correct option.

A and B completed a work together in 5 days. Had A worked at twice his own speed and B half his own speed, it would have taken them 4 days to complete the job. How much time would it take for A alone to do the job?

10 days
20 days
25 days
15 days

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