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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?

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? Correct Answer 20 days

The work is increased by 8 times so the total work to be completed is [1 + 8 = 9] A completes 1/5 work in a day [ because he completes the work in 5 days] B completes 1/4 work in a day[ because he completes work in 4 days] So working together A&B completes 1/5 + 1/4 = 9/20 work in one day therefore the total increased work 9 will be completed in 20 days.

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