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A alone can do a piece of work in 20 days and B alone in 30 days. They begin to work together. They will finish half of the work in :
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- 8 days
- 9 days
- 12 days
- 6 days
Correct Option: D
(A+B)’s 1 day’s work
| = | + | = | = | |||||
| 20 | 30 | 60 | 12 |
∴ Work done in 6 days
| = | = | |||
| 12 | 2 |
Aliter : Using basics of Rule 2,
Here, x = 20, y = 30
They do the work in
| = | days | x + y |
| = | = 12 days | 20 + 30 |
Half of the work they do in 6 days
