tense and time and composite sentence

If the eating meal starts at 7:00 AM and finishes at 8:00 AM. the drinking liquor starts at 7:00 AM and finishes at 7:50 AM.

can I say that :

1. 
   

   I drank the liquor when I ate the meal.

   
   


2. 
   

   I ate the meal when I drank the liquor.

   
   

Is I need to use progressive tense ?

Answer

Both of your sentences would reflect the time sequences you've outlined

I drank liquor when I ate my meal
I ate my meal while I drank liquor

since there were 50 mins of overlapping time.

You could also say

I finished drinking my liquor before finishing my meal.

I had finished my liquor before I finished my meal.

You don't need to use the progressive tense.