Answer: "<u><em>Comía</em></u>" and "<u><em>miraba</em></u>" are conjugated in the imperfect past.
<u><em>Comía</em></u>y<em><u>miraba</u></em>la televisión cuando se apagó la luz.
Apagó is conjugated in the <em>preterite</em>.
Translation: I was eating and watching television when the light went out.
Explanation:
When several verbs that describe actions in the past are combined in the same sentence, the imperfect past tense verbs (eating and watching) describe what was happening in the past and the preterite tense verbs (went out) describe actions that interrupted the actions that were already taking place.
