(Originais Teachy 2024) - Question Easy of Spanish

During an educational excursion to a Spanish-speaking country, a group of 1st-year high school students faced an unexpected challenge: organizing a tourist itinerary using local means of transportation. One day, the agenda included a visit to a tourist attraction located 20 km away from the city where they were staying. The group intended to use a bus that departed every 30 minutes, and they knew that the journey would take approximately 40 minutes, considering possible stops at other points of interest. Upon arriving at the bus terminal, they realized that the first bus of the day had left without them, and now they needed to adjust the itinerary to not miss the opportunity to visit the planned attraction. Taking into account the context of the situation described and the vocabulary related to travel and transportation in Spanish, how should the students proceed to calculate the waiting time for the next bus and ensure that they can still visit all the planned attractions, considering the possibility of additional waiting time and the total time of the visits?