Raj can do a piece of work in 20 days. He started the work and left after some days, when 25% work was done. After it Abhijit joined and completed it working for 10 days. In how many days Raj and Abhijit can do the complete work, working together?
Working 5 hours a day, A can Complete a work in 8 days and working 6 hours a day, B can complete the same work in 10 days. Working 8 hours a day, they can jointly complete the work in
A and B together can complete a work in 3 days. They start together but after 2 days, B left the work. If the work is completed after two more days, B alone could do the work in
(A+B)’s one day’s % work = 100/3 = 33.3%
Work completed in 2 days = 66.6%
Remaining work = 33.4%;
One day’s % work of A = 33.4/2 = 16.7%;
One day’s work of B = 33.3 – 16.7 = 16.7%;
B alone can complete the work in,
= 100/16.7 = 6 days.
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If A and B together can complete a work in 18 days, A and C together in 12 days, and B and C together in 9 days, then B alone can do the work in
