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Unfortunately, "Estimated time of arrival back to school" isn't the official answer. The second clue is available here and in the post.

This answer is officially recognized as an alternative solution and rewarded with 0.25 SBD.
I hope you'll participate in my new contest:
https://steemit.com/crackthecode/@barcisz/crack-the-code-1-contest-with-sbd-to-win