What is the meaning of the following statement: The average speed that maroga's taxi used from mankweng to polokwane was 110km/h

The average of several values  is got by adding all
the values and dividing by the number of values.

The
maroga's taxi  could have gone at different speeds at different times. Then the total
distance travelled divided by the total time the taxi took to finish the complete
distance is the average speed.

As a particular simple
example ( constructed for the purpose please) , the taxi might have travelled 75km/h for
1 hour , 120km for hours and  115km for 3 hours.

Then the
total distance travelled = (75*1+120*2+115*3)kms =
660kms.

The total time taken to complete the travel =
(1+2+3) hrs = 6 hrs.

Then the average speed of the taxi =
Total distance travelled /total time taken for the travel = 660km/6h =
110km/h.

The average gives an over all
information.