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Answer:
1. Yo nunca _<u>HE TENIDO</u>_ (tener) problemas en mis viajes.
Explanation:
I have never had problems in my trips.
<em>Tener</em> is in infinitive, it means <em>to have.</em>
In this case you are refering to events in the past with continuity so you use the pretérito perfecto (past perfect) which is HE TENIDO.
That means that in the trips you have done over your life, there have not been any problems. The possibility of more trips in the future, and problems in them, is open.
Is there any choices for this question?
Every day he walks 7.5 hrs
So in three days he walks 7.5×3 =22.5hrs
And he travelled 65km in these 22.5hrs
So the speed = distance/time
= 65/22.5 = 2.88km/hr
Speed of the man will remain same,
So time = distance/speed
= 156/2.88 = 54 hrs
Everyday he walks 8hrs, so for 54 hrs, he has to walk 54/8 = 6.75 days
