Workers or pipes working on alternate days or hours: time to finish

1. A.
   $24\frac{2}{5}$
2. B.
   $5\frac{2}{5}$
3. C.
   $5\frac{3}{5}$
4. D.
   $24\frac{3}{5}$

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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.
   $38\frac{1}{12}$
2. B.
   $36\frac{1}{2}$
3. C.
   $36$
4. D.
   $39\frac{1}{12}$

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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.
   28
2. B.
   24
3. C.
   20
4. D.
   18

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1. A.
   $24$
2. B.
   $20\frac{1}{4}$
3. C.
   $20\frac{3}{4}$
4. D.
   $22\frac{3}{8}$

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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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1. A.
   $10\frac{3}{7}$
2. B.
   $11\frac{3}{7}$
3. C.
   $9\frac{3}{7}$
4. D.
   $12\frac{3}{7}$

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