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If A can complete 2/5 of work in 9 days, then he can complete whole work in (9×5)/2 = (9×5)/2 = 22.5 days. Let B take x number of days to complete the work. According to question, (2/45 + 1/x) × 6 = 3/5 x = 18 days. So, the answer would be option d) 18 days
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