17. Which sample will have the highest concentration in a spectrophotometer colorimetric measurement?
1. The one with the highest transmittance
2. The one with the highest absorbance
3. The one with the lightest color
4. The one with the highest turbidity

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