Answer: (B) 1/3

Explanation:

The ratio of efficiency is A : B : C is 1/3: 1/4 : 1/6

Let work done is unity.

So, the total work done is

x/3+ x/4 + x/6 = 1

[Multiply by 12 on both sides]

4x + 3x + 2x = 12

9x = 12

x = 4/3

Hence, the total fraction of work done by B = x/4 = 1/3

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Answer:

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ANSWER -: B.) 1/3.

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