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Julie drives 88 mi to Grandmother's house. On the way to Grandmother's, Julie drives half the distance at 31 mph and half the distance at 70 mph.

Julie drives 88 mi to Grandmother's house. On the way to Grandmother's, Julie drives half the distance at 31 mph and half the distance at 70 mph. On her return trip, she drives half the time at 70 mph and half the time at 31 mph.
What is Julie's average speed on the way to Grandmother's house?

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