A can finish a work in 5 days and B takes 4 days to do the same work If the work is increased by 8 t...........

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A can finish a work in 5 days and B takes 4 days to do the same work. If the work is increased by 8 times, How many days will it take for both of them to finish the work if they work together?

10 days

15 days

25 days

20 days

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Explanation:

Let the total work be 100%
A can do the work in 5 days,
so he can do 20% work in 1 day
B can do the work in 4 days,
so he can do 25% work in 1 day
Together they can do 20+25 = 45% work in 1 day
Now the work is increased by 800%,
so the work becomes 900%
The work can be done in 900/45 = 20 days