Banksy and the tradition of destroying art
Which statement best express the central idea of the text

Remote sensing of the earth's surface and atmosphere may involve the use of what type of instruments?

Summarize the work of famous environmental scientists of the past.

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?