A farmer can plough a field working 6 hours per day in 18

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A farmer can plough a field working 6 hours per day in 18 days. The worker has to work how many hours per day to finish the same work in 12 days ?

1. 7 hrs
2. 9 hrs
3. 11 hrs
4. 13 hrs

Correct Option: B

Using Rule 1,
D₁T₁ = D₂T₂
⇒ 18 × 6 = 12 × T₂

⇒ T₂ =	18 × 6	= 9 hours
	12