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2 men each working 5 hour per day can f...

2 men each working 5 hour per day can finish a job in 12 days. How long will 4 men each working 2 hours per day take to finish the same job?

Text Solution

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let the number of days be x.
The ratio of number of days=12:x
Number of days it takes is inversely proportional to the number of hours each man works per day and the number of men at work.
`therefore12:x=4xx2:2xx5`
`implies(12)/(x)=(8)/(10)impliesx=(10xx12)/(8)=15` days
`therefore` 4 men each working 2 hours per day can finish the job in 15 days.
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