Two work on alternate days (or hours): time to finish

1. A.
   $12\frac{1}{2}$ days
2. B.
   $14\frac{1}{4}$ days
3. C.
   $13\frac{1}{3}$ days
4. D.
   $15\frac{1}{5}$ days

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1. A.
   40
2. B.
   60
3. C.
   48
4. D.
   45

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1. A.
   $5\frac{1}{3}$
2. B.
   $5\frac{2}{3}$
3. C.
   $5$
4. D.
   $5\frac{1}{4}$

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1. A.
   $13\frac{2}{5}$
2. B.
   $12\frac{1}{6}$
3. C.
   $13\frac{1}{2}$
4. D.
   $13$

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1. A.
   3 hours
2. B.
   4 hours
3. C.
   2 hours
4. D.
   4.5 hours

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1. A.
   $14\frac{2}{3}$
2. B.
   $14\frac{1}{3}$
3. C.
   $15\frac{1}{3}$
4. D.
   $15\frac{2}{3}$

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1. A.
   $12\frac{3}{4}$ days
2. B.
   12 days
3. C.
   13 days
4. D.
   $13\frac{3}{4}$ days

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1. A.
   $11\frac{1}{3}$
2. B.
   $12\frac{1}{3}$
3. C.
   $10$
4. D.
   $10\frac{1}{3}$

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