Question

A can do a piece of work in 20 days and B can do it in 30 days. How long will they
take to do the work together?
(A)10 days
(B) 12 days
(C) 11 days
(D) 20 days
​

Answer 1

Answer:

Option B is correct

Explanation:

A can do a piece of work in 20 days and B can do the same piece of work in 30 days. Find that in how many days both can do the work? So, the work will be completed in 12 days if they work together. Hence option [B] is correct answer.

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Answer 2

Answer:

10 days.

Explanation:

This is an example of indirect proportion.

In this the product remains constant.

Therefore if both will do work together then they will require less time, and less number of days.

Therefore, 30 - 20 = 10 days.