Question

A and B working separately can
do a piece of work in 9 and 15
days respectively. If they work
for a day alternately, with A be-
ginning, then the work will be
completed in
(1) 10 days
(2) 11 days
(3) 9 days
(4) 12 days
​

Answer 1

Answer:

11 days

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

(A and B)'s first 2 days work=1/9+1/15=(5+3)/45=8/45. (A and B)'s first (5*2)days work=5*8/45=40/45 Remaining work=1-40/45=5/45=1/9. So,the work will be completed by=10+1=11 days