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A man can do a job in 15 days. His father takes 20 days and his son finished it in 25 days. How long will they take to complete the job if they all work together?

A man can do a job in 15 days. His father takes 20 days and his son finished it in 25 days. How long will they take to complete the job if they all work together? Correct Answer Approximately 6.4 days

Together in 1 day they can do = ( 1/15 + 1/20 + 1/25) portion = 47/300 portion 47/300 portion is done in 1 day 1 full portion dine in 300/47 day = 6.38297873 = 6.4

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