What major advantage did Britain have over China which could be the reason the Industrial Revolution started there?

Britain had the advantage of an absence of internal trade barriers. This means that products and goods could move from one area of Britain to another, without being taxed. This encouraged internal British trade. In addition, the British government allowed its population to relocate to different towns.

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