A can do a certain job in 25 days which B alone can do in 20 days.A started the work and was joined by B after 10 days.In how many days was the whole work complete?
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Work done by A in l0 days = (1/25) x 10 = 2/5
Remaining work = 1 - (2/5) = 3/5
(A+B)s 1 days work = (1/25) + (1/20) = 9/100
9/100 work is done by them in 1 day.
hence 3/5 work will be done by them in (3/5)*(100/9)
= 20/3days.
Total time taken = (10 + 20/3) = 16 x (2/3) days
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