If S (strength) and H (hardness) are indexes of a timber at 12% moisture content, the composite sleeper index is:

1
\(\frac{H + 10 S}{20}\)
2
\(\frac{S + 20 H}{10}\)
3
\(\frac{20 S + H}{10}\)
4
\(\frac{S + 10 H}{20}\)

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