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5 persons can prepare an admission list in 8 days working 7 hours a day. If 2 persons join them so as to complete the work in 4 days, they need to work per day for :
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- 10 hours
- 9 hours
- 12 hours
- 8 hours
Correct Option: A
Using Rule 1,
More persons, less working hours/day
Less days, more working hours/day
 | : : 7 : x | Days 4 : 8 |
where, x is hours/days
∴ 7 × 4 × x = 5 × 8 × 7
| ∴ x = | = 10 hours | 7 × 4 |
