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how do green roofs compare to traditional roofs?
o green roofs have less impact on the energy performance of buildings
o green roofs have greater stormwater runoff
o green roofs initially cost more to install
o green roofs need more frequent replacement

You have trained year for a marathon. in your first attempt to run a marathon, you decide that you want to complete this 26-mile race in 4-5 hours. a. what is the length of a marathon in kilometers (1mile= 1.6 kilometers). b. what would your average speed have to be to complete the race 4.5 hours? give your answer in kilometers per hour.