Two vertical poles, lines from each top to the foot of the other: height of the crossing = ab/(a+b)

1. A.
   $\frac{3}{8}$ cm
2. B.
   $\frac{5}{8}$ cm
3. C.
   $\frac{9}{8}$ cm
4. D.
   $\frac{15}{8}$ cm

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1. A.
   $\frac{200}{117}$
2. B.
   $\frac{212}{117}$
3. C.
   $\frac{275}{117}$
4. D.
   $\frac{250}{117}$

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1. A.
   4.8 m
2. B.
   5 m
3. C.
   6 m
4. D.
   6.4 m

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