K can do 3/4 work in 6 days So, K can do a work in 6 x 4 / 3 days = 8 days similarly, J can do a work in 4 x 5 / 2 days = 10 days working together = 1/8 + 1/10 = 5 + 4 / 40 = 9/40 = 4 (4/9) days
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