Mathematics · Time and Work
X and Y can complete a work in 9 days and 36 days, respectively. X begins to do the work and they work alternately, one at a time, for one day each. The whole work will be completed in:
- 115 1 5 days
- 213 1 3 days
- 314 1 4 days✓
- 412 1 2 days
Correct answer
14 1 4 days
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