Discussion :: Time and Work
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A and B can together finish a work 30 days. They worked together for 20 days and then B left. After another 20 days, A finished the remaining work. In how many days A alone can finish the work?
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Answer : Option D
Explanation :
| (A + B)'s 20 day's work = |  | 1 | x 20 |  | = | 2 | . |
| 30 | 3 |
| Remaining work = | | 1 - | 2 | | = | 1 | . |
| 3 | 3 |
| Now, | 1 | work is done by A in 20 days. |
| 3 |
Therefore, the whole work will be done by A in (20 x 3) = 60 days.
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