Where is the question?
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In the long run, no.
Whenever there is an increase in immigration, we will experience a short period time of growth due to an increase in productivity level.
But, Immigrants tend to send the fruit of their labor back to their families in original country, which means the capital is not distributed back to South Africa but rather to Brazil
Speed= distance/time
given time=15minutes
convert minutes to seconds 15×60=900
distance=20/1000 = 0.02metres
speed = 0.02/900
= 2.22×10^-5
the average speed is 2.22×10^-5 m/s