To calculate the value of \( X \) given the distances \( 11.9 , \text{km} \) and \( 14.7 , \text{km} \), you'll need to determine what the relationship is between these distances and \( X \) before finding the solution.
If we assume that you want to determine the distance that adds up to some total or is part of a specific ratio, you would typically provide additional context.
However, if we take a common interpretation—perhaps finding the total distance or some average—then:
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Adding the two distances together: \[ 11.9 , \text{km} + 14.7 , \text{km} = 26.6 , \text{km} \]
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There isn't a clear indication from any of the provided choices (74.5 km, 8.6 km, 18.9 km, or 2.8 km) that directly leads to a calculation for \( X \).
Assuming your question concerns some possible calculation involving \( X \), we can't find a direct connection without more context. None of the given responses seem to pair logically with the initial values of 11.9 km and 14.7 km.
If you have clarification on how \( X \) relates to the other distances, please provide it, and I can assist in finding the correct value for \( X \).