A is 60% more efficient than B. In how many days will A and B working together complete a piece of work which A alone takes 15 days to finish?
\(\frac{{124}}{{13}}\) days
\(\frac{{113}}{{13}}\) days
\(\frac{{108}}{{13}}\) days
\(\frac{{131}}{{13}}\) days
\(\frac{{120}}{{13}}\) days
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