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Q.

A man can complete his work in Question Image days by working Question Image hours a day. How many days will he take to complete the same work working Question Image hours a day ?


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a

5

b

10

c

15

d

20 

answer is C.

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Detailed Solution

Concept- Time and work have been concerned with the amount of time it takes an individual or a group of individuals to complete a piece of work and the efficiency with which each of them completes it.
If the man works more hours per day, the work will be completed in fewer days.
As a result, the number of hours worked and days taken are inversely proportional.
Let the number of days taken do the work be as if the man worked 8 hours a day.
Then, 24:a : inverse ratio of 5:8
Question ImageWhen applying the rule, product of extremes = product of means Question ImageQuestion ImageQuestion ImageTherefore, the man will take 15 days to do the work.
Hence, the correct answer is option (3).
 
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A man can complete his work in days by working hours a day. How many days will he take to complete the same work working hours a day ?