Question

A can do a piece of work in 4 days and B in 5 days. How long will they take to do the same
work, when working together?
2/25
​

Answer 1

Explanation:

A can do a piece of work in 4 days and B in 5 days. How long will they take to do the same

work, when working together?

2/25

Answer 2

Explanation:

A completes the work in 4 days

then

A can complete 1 / 4 th of the work in a day

Similarly

B can complete 1 / 5 th of the work

Then A and B can complete (1/4 +1/5 = 9 / 20 th of the work in a day )

both can complete the work in 20/9 days