Old stained-glass windows are usually made of colored glass pieces (silicon dioxide with coloring compounds like gold chloride) held together with strips of lead. What type of mixture are old stained-glass windows? Group of answer choices

A. Mixture of elements

B. Mixture of compounds

C. Mixture of element(s) and compound(s)

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