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Which sentence is correct and why?

il y a 7 mois
1) There are three tests and EVERY lasts for one hour. 2) There are three tests and EACH lasts for one hour. 3) There are three tests and EACH OF THEM lasts for one hour.

Thank you!
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Jessica
FlagChinois mandarinIl y a 3 heures
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FlagAnglaisIl y a un jour
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jamila
FlagArabeIl y a 7 heures
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