puppystar159p51vxk
26.10.2019 •
Chemistry
Atrain travels 74 kilometers in 3 hours, and then 73 kilometers in 2 hours. what is its average speed? km/hr
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Ответ:
(74 + 73) km ÷ (3+2) hours
147 km÷ 5 hours
29.4 km/h
Ответ:
Poor air and water quality, insufficient water availability, waste-disposal problems, and high energy consumption are exacerbated by the increasing population density and demands of urban environments. Strong city planning will be essential in managing these and other difficulties as the world's urban areas swell.