Question 1204131
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As it is given in the post,  the problem can not be solved,  at all,  since the input data is not enough for it.


In his solution,  @Theo assumed implicitly  (without making it directly),  that the rate of 

Cameron's watch is normal,  although it does not follow neither from the text nor from the context.



So,  as given,  this post is badly worded puzzle,  but not a  Math problem.