Time and Work Practice Test 5 with solutions

Question : 17 of 30

Marks: +1, -0

A works twice as fast as B. If B can complete a piece of work independently in 12 days. Find in how many days A and B together can complete the work?

8 days
6 days
4 days
18 days

Validate

Solution:

Ratio of efficiency of A and B = 2 : 1
Then, ratio of their time taking = 1 : 2
Hence, if B can complete the work in 12 days, then A in 6 days.
Now, (A + B)'s 1 day's work =

1/6 + 1/{12}

3/{12}

1/4

So, A and B together can complete the work in 4 days.

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