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Karim and Bablu can build a wooden table in 3 days. Bablu can do it alone in 5 days. How many days would it take Karim to do this job alone?

Karim and Bablu can build a wooden table in 3 days. Bablu can do it alone in 5 days. How many days would it take Karim to do this job alone? Correct Answer 7.5

Bablu can build 1/5 of the table in a day. Together they can build 1/3 of the table in a day. Therefore, Karim can build (1/3 - 1/5 = 2/15) of the table in a day. So, Karim can build the complete table in 15/2 = 7.5 days

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