Translation of pollution in Spanish

One hour later people were starting to leave and we did not exactly understand why. We took another drink and I paid the bar man cash. Later it turned out that the change he gave me would be fake money.
I have studied at the faculty of Engineering. Just tell me about your difficulties and I'll try to help you. I would really like to help you with learning English. Kind regards and speak to you soon.
The hill was not close to the village and we did not have a lot of water with us, so that we were happy when a Brazilian couple took us closer in their rented Jeep. We walked a little further.