- 64/3
- 32/3
- 56/3
- 51/3

Option 1 : 64/3

**Given:**

Two labourers A and B working together completed a task in 8 days. A worked thrice as efficiently as he did earlier and B did with one third of the efficiency, in such case the work would finish in 6 days.

**Concept used:**

Time and work

**Calculation:**

According to the question

⇒ (A + B) × 8 = (3A + B/3) × 6

⇒ 8A + 8B = 18A + 2B

⇒ 6B = 10A

⇒ A : B = 3 : 5

Total work will be (A + B) 8

Total work = 64 unit

A will complete the whole work in **64/3 days**

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