Question

A and B can finish a piece of work in 20 days and 30 days, respectively, if they work
separately. How long will they take to do the same work if they work together?​

Answer 1

Answer:

30 x 20/(30 + 20) = 600/50 = 12 days. => They work together to complete remaining 25/30 work in : 12 x 25/30 = 10 days.

Answer 2

Answer:

Question:

A and B can finish a piece of work in 20 days and 30 days, respectively, if they work

separately. How long will they take to do the same work if they work together?

Solution:

Given,

A can do work - 20 days

B cna do work - 30 days

To Find:

Time taken together to do work ?

Formula Used:

$= \frac{a \times b}{a + b}$

Step by Step"

$= \frac{20 \times 30}{20 + 30}$

$= \frac{600}{50}$

$= 12$

The Answer be 12 days.