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(2) 97 = 1 (mod 24). ANSWER
(3) 9 + 13 = 22 = 10 (mod 12). ANSWER
Solved.
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I just explained it yesterday how to find hours on 6-hour, 12-hour and 24-hour clock.
See the links
https://www.algebra.com/algebra/homework/testmodule/testmodule.faq.question.1192649.html
https://www.algebra.com/algebra/homework/testmodule/testmodule.faq.question.1192647.html
Do you expect I will repeat it every day ?