Answer:
16,342seconds
Step-by-step explanation:
Average velocity is defined as the rate of change in displacement of a body. Mathematically,
Average velocity = Displacement/Time
Given average distance a person can run = 42km = displacement
Average velocity = 2.57m/s
Substituting the values in the formula to get the time;
Time = Displacement/velocity
42km to metres = 42000m
Time = 42000/2.57
Time = 16,342seconds
It will take approximately 16,342seconds to finish the race