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A and B working separately can do a piece of work in 9 and 12 days respectively. If they work for a day alternately with A beginning work would be completed in: 

(a) 32/3 days 

(b) 21/2 days 

(c) 41/4 days 

(d) 31/3 days

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Correct option (c) 41/4 days



A’s one day work = 4 units

B’s one day work = 3 units

Since they work on alternate day they 

will do 7 units in 2 days. 

This 2 days cycle will continue Now, 

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