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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, the work would be completed in
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10 2 days 3 -
10 1 days 2 -
10 1 days 4 -
10 1 days 3
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Correct Option: C
Part of work done by A and B in first two days
| = | + | = | = | ||||
| 9 | 12 | 36 | 36 |
Part of work done in first 10 days = 35/36
| Remaining work = 1 - | = | ||
| 36 | 36 |
Now it is the turn of A.
∴ Time taken by A
| = | × 9 = | days | ||
| 36 | 4 |
+= 10 1 4 10
| ∴ Total time = 10 + | = 10 | days | ||
| 4 | 4 |
