遠く just means 'far', while 遙か emphasizes a distance/difference between two things.
遙か遠くに far away
遙かかなたの宇宙 faraway universe
遙かなるあこがれ distant yearnings
遙か昔 a long long time ago
遙か先のこと the remote future
遙かに大きい by far larger
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遥かis a written word
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I think 筱伟 wanted to say the inflection of japanese is difficult.(^_^)