A does 2/5 of a work in 9 days. Then b joined him and they together completed the remaining work in 6 days. B alone can finish the whole work in...... 1. 12/13 days 2. 2/11 days 3. 10 days 4. 18 days
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Step-by-step explanation:
In 9 days, A finishes 2/5 work
In 1 day, A finishes (2/5)/9 work
=2/45 work
In 6 days, A and B finsihes the work
In 1 day, A and B finishes 1/6 work
Hence,
B's 1 day work= A and B's one day work- A's one day work
=1/6 -2/ 45
= (15-4)/90
= 11/90
Hence, B alone finishes the work in 90/11 days
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