A man can do a job in 15 days
Asked by admin @ in Math viewed by 271 People
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?
Answered by admin @
(15×20×25)÷(15×20+15×25+25×20)=6(18÷47)or 6.38
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