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By definition the average speed is the ration of the total traveled distance and the total traveled time. Let us introduce the total traveled distance of the car as L. Then the time of the travel up the hill is
t1 = L/74
The time of the travel down the hill is
t2 = L/132
The total traveled time is
t = t1 + t2 = L/74 + L/132 = 0.0211 L
Then the average velocity is
Vavg = L/t = L/0.0211 L = 47.393 km/hr
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