A) 7
B) 8
C) 9
D) 11
Correct Answer: C
Solution :
Since 15 men take 10 days working 12 hours per day, the total work done measured in terms of man-hours is \[15\times 10\times 12\]. When 10 men are required to complete the same job in 20 days working hours a day, work done \[=10\times 20\times h\] But \[10\times 20\times h=15\times 10\times 12\]. Hence the number of hours for which they should work per day is \[\frac{15\times 10\times 12}{10\times 20}=9\] \[\therefore \] 10 men can complete the work in 20 days working for 9 hours per day.
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