How far could you speed walk in 10 minutes based on your speed in a 10 meter trial

What is the reason for the “scramble for africa”?

After railroads, the next revolution of transportation came with the development of (a) automobile (b) telegraph (c) steam engine

Which are practical examples of how people in the developed world could make a big difference in how much water they use check all that apply a. use lightbulbs that use less electricity b. consider using a composting toilet that does not use water c. avoid using your telephone during peak hours d. do not read books