Question 1208145
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This problem was posted to the forum and answered about a month ago.


See the solution and the answer to this question by tutor ankor@dixie-net.com at this forum under the link


https://www.algebra.com/algebra/homework/word/misc/Miscellaneous_Word_Problems.faq.question.1207558.html



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To learn more about determining speed of light, read these fascinating sources


(1) Who, when and how first determined speed of light 


https://www.amnh.org/learn-teach/curriculum-collections/cosmic-horizons-book/ole-roemer-speed-of-light#:~:text=In%201676%2C%20the%20Danish%20astronomer,eclipses%20of%20Jupiter's%20moon%20Io.



(2) The book by Michelson about his experiments on determining speed of light


https://www.gutenberg.org/cache/epub/11753/pg11753-images.html


https://apps.dtic.mil/sti/tr/pdf/ADA434600.pdf