What is the formula for the Composite sleeper index of a wooden sleeper?

What is the formula for the Composite sleeper index of a wooden sleeper? Correct Answer CSI = (S + 10H)/20

Composite sleeper index has advanced from a combination of properties of strength and hardness of the sleeper. The correct formula for Composite sleeper index of a wooden sleeper is given by CSI = (S + 10H)/20.
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