3 years ago in Time and Work

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] 6 days
[B] 10 days
[C] 15 days
[D] 20 days
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Nguyễn Trường
Nguyễn Trường - 6 months ago

Nguyễn Trường from Ho Chi Minh City, Vietnam is saying 6 days is correct answer

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