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Distance = speed*time
Distance travel at first two hours `= 40xx2 = 80km`
Distance travel at second 3 hours `= 50xx3 = 150km`
Average speed = (total distance)/(total time)
Average speed `= (80+150)/(3+2) = 230/5 = 46 (km)/h`
So the average speed of the dove is 46km/h.
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