X and Y can do a piece of work in 20 days and 12 days respectively. X started the work alone and then after 4 days Y joined him till the completion of the work. How long did the work last?
X and Y can do a piece of work in 20 days and 12 days respectively. X started the work alone and then after 4 days Y joined him till the completion of the work. How long did the work last?
A). 13 days
B). 12 days
C). 11 days
D). 10 days
1 answers
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2021-07-05 07:00:24 | Votes
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# 10 days
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