Question : Working for 10 hours per day, 6 men can build a wall in a certain number of days. By working for how many hours/per day can 12 men build the wall on the same day?
Option 1: 7 hours 30 minutes
Option 2: 5 hours
Option 3: 20 hours
Option 4: 10 hours
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Correct Answer: 5 hours
Solution :
Total time needed to complete the work = 6 × 10 = 60 hours
Time needed by 12 men to complete the work = $\frac{60}{12}$ = 5 hours
Hence, the correct answer is 5 hours.
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