If 80 persons can finish a work within 16 days by working

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If 80 persons can finish a work within 16 days by working 6 hours a day, the number of hours a day, should 64 persons work to finish that very job within 15 days is :

1. 5 hrs.
2. 7 hrs.
3. 8 hrs.
4. 6 hrs.

Correct Option: C

Using Rule 1,
M₁D₁T₁ = M₂D₂T₂
⇒ 80 × 16 × 6 = 64 × 15 × T₂

⇒ T₂ =	80 × 16 × 6	= 8 hours
	64 × 15