How do i know the answer are correct

17 a tourist was planning a trip by car for travelling at some constant speed for 2.5 hours. however, he found that if he increases the speed by 20 km/h he can cover the same distance in 30 minutes less time than it was planned. what was the planned speed of the tourist, in km/h?

Carbon dioxide can be produced form what type of power generation?

Winds are formed from the sun's uneven heating of the earth's atmosphere. the wind patterns are altered by bodies of water, different landforms, and plant cover. because of this, the wind is considered a form of