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'A' alone can do a certain job in 15 days while B alone can do it in 10 days. 'A' started the work and was joined by B after 5 days. For how long did this work last?
None of these
According to the question,
In 5 days A can complete=115×5=13rd of the work
Remaining work =1-13=23
In one day (A+B) can complete=115+110=2+330=530=16th of the work
∴ 23 rd of the work will be finished by (A+B) in 23×6 days that is in 4 days.
∴ Total time taken= (5+4) days =9 days.
Hence option D is the correct.
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