Help with a Quant Question (GREPrepClub)

Hi all, can anyone please help me with this problem? It’s from GREPrep Club. Thanks in advance.

I think someone just changed the wordings of an Official GMAT question.
The solution for the official one is discussed here https://gmatclub.com/forum/average-speed-on-gmat-140271.html

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Okay thank you very much.