A work can be finished by 8 men in 10 days working 6 hours a day or same can be finished by 20 qualified workers in 6 days working 8 hours a day. 2 men and 4 qualified workers work simultaneously 10 hours a day, the work will be finished in _______ days.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 12.
Total work = 8 × 10 × 6 = 480 man-hours
1 man = 2 qualified workers ⇒ 4 qualified workers = 2 men
So, total = 2 + 2 = 4 men
Daily work = 4 × 10 = 40
Days = 480 ÷ 40 = 12