BIG assumption, but if the 'q' is about distance from an alternate,
this may answer the query. In EU land each company is required to specify a 'S.Eng cruise speed' and that determines the distance for the 1 hour limit. EU-OPS applies. ATW merely needs to look in his/her ops manuals (if he/she has any!
) and the 'difficult' question will be magically solved.