Question 528000
At first, you've traveled 9*45 = 405 km


Afterwards, you've traveled 9*69 = 621 km


Add these two distances to get a total distance traveled of 405+621 = 1026 km



This is all over a time-span of 9+9 = 18 hrs



So the average speed is 1026/18 = 57 km/hr



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