1. Which statement BEST explains why coal is used to generate electricity despite the amount of pollution produced by burning coal?
A Compared to other fuels, coal produces more energy per kilogram.
B. Compared to other fuels, coal is relatively cheap and plentiful.
C. Coal burns without producing greenhouse gases.
D. Coal is a renewable source of energy.

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answer;

18.5 seconds

explanation;

velocity is distance covered per unit time; it is given by displacement divided by time.

thus; time = displacement/velocity

total time = total displacement/velocity

total distance = 5000 meters south

total time = 5000/4.5

                  = 1111.11 seconds

but; 1 minute = 60 sec

thus; 1111.11 /60

                = 18.51 seconds

thus; the time taken is 18.5 seconds