A and B working separately can do a piece of work in 9 and 12 days respectively. If they work for a day alternately,A beginning, in how many days, the work Will be completed
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(A+B)'s 2 days work = (1/9 + 1/12)= 7/36
(A+B)'s 10 days work = 10/2 *7/36 = 35/36
remaining work (1- 35/36 = 1/36) has to be done by A on 11th day,
its done by A in 9* 1/36 = 1/4 day
total time = 10 +1/4 = 41/4 days
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