Julie drives 100 mi to Grandmother's house. On the way to Grandmother's, Julie drives half the distance at 33.0 and half the distance at 80.0 . On her return trip, she drives half the time at 33.0 and half the time at 80.0 .
What is Julie's average speed on the way to Grandmother's house?

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already answered

(33.0+80.0)/2=56.5
from this formula ==> average speed = (V1+V2+V3+...)/n

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