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A can do one and a half as much of a work which B can do in one day. B alone can do a piece of work in 18 days. They together can finish that work in
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10 1 days 5 -
11 1 days 5 -
5 1 days 5 -
7 1 days 5
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Correct Option: D
Using basics of Rule 2,
Ratio of efficiency of A and B = 3 : 2
Ratio of time taken = 2 : 3
∴ Time taken by A
| = | × 18 = 12 days | 3 |
∴ (A + B)’s 1 day’s work
| = | + | = | = | |||||
| 12 | 18 | 36 | 36 |
∴ Required time
| = | = 7 | days. | ||
| 5 | 5 |
