1.

A and B work together can do a piece of work in 12 days, while B alone can finish it in 30 days. A alone can finish the work in:1. 5 days2. 20 days3. 11 days4. 25 days

Answer» Correct Answer - Option 2 : 20 days

Given:

A and B work together can do a piece of work in 12 days

B alone can finish it in 30 days

Calculation:

Work done by (A + B)'s in 1 day = 1/12 days

Work done by B's in 1 day = 1/30 days

Work done by A's in 1 day = (1/12 – 1/30)

⇒ (5 – 2)/60 = 1/20

∴ A alone can finish the work in 20 days.



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