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A can do 7/8 of work in 28 days, B can do 5/6 of the same work in 20 days. The number of days they will take to complete if they do it together is
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15 3 days 7 -
17 3 days 5 -
14 5 days 7 -
13 5 days 7
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Correct Option: D
Using basics of Rule 2,
| A does | work in 28 days. | 8 |
∴ A will complete the work in
| 28 × | = 32 days. | 7 |
| B does | work in 20 days. | 6 |
∴ B will complete the work in
| = 24 days | 5 |
∴ (A + B)’s 1 day’s work
| + | = | = | ||||||
| 32 | 24 | 96 | 96 |
∴ Required time
| = | = 13 | days | ||
| 7 | 7 |
