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A Man Can Do A Job In 15 Days. His Father Takes 20 Days And His Son Finishes It In 25 Days. How Long Will They Take To Complete The Job If They All Work Together? |
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Answer» Find the 1 DAY work for all three 1 day's work for all three = (1/15 + 1/20 + 1/25) = (20/300 + 15/300 + 12/300) = 47/300 So all together can do the work in 300/47 DAYS. => 6.4 days. Find the 1 day work for all three 1 day's work for all three = (1/15 + 1/20 + 1/25) = (20/300 + 15/300 + 12/300) = 47/300 So all together can do the work in 300/47 days. => 6.4 days. |
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