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Explanation:

Statement I: Given that x satisfies the equation,

log2x=xx=2x
This equation is satisfied by the values x = 4 and 16.
Hence, statement I alone is not sufficient.
Statement II: Nothing concrete can be concluded from the fact that x ≤ 10 km.
Hence, statement II alone is not sufficient.
Combining statements I and II, we get a unique value of x = 4 km.

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