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x can copy 80 pages in 20 hours, x and y together can copy 135 pages in 27 hours. Then y can copy 20 pages in
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- 20 hours
- 3 hours
- 24 hours
- 12 hours
Correct Option: A
According to question ,
| Number of pages copied by x in hour = | = 4 | |
| 20 |
| Number of pages copied by x and y in 1 hour = | = 5 | |
| 27 |
∴ Number of pages copied by y in 1 hour = 5 – 4 = 1
∴ Required time = 20 hours.
