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A does 2/5 of a work in 9 days. Then B joined him and they together completed the remaining work in 6 days. B alone can finish the whole work in
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6 12 days 13 -
8 2 days 11 - 10 days
- 18 days
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Correct Option: D
| Remaining work = 1 - | = | parts | ||
| 5 | 5 |
| ∵ (A + B) together do | th part of work in 6 days. | 5 |
∴ Time taken by A and B in doing whole work
| = | = 10 days | 3 |
| A does | th part of work in 9 days. | 5 |
∴ Time taken by A in doing whole work
| = | = | days | ||
| 2 | 2 |
| ∴ B’s 1 day’s work = | - | |||
| 10 | 45 |
| = | = | = | ||||
| 90 | 90 | 18 |
∴ Required time = 18 days .
