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Julie drives 100 mi to Grandmother's house. On the way to Grandmother's, Julie drives half the...

Julie drives 100 mi to Grandmother's house. On the way to Grandmother's, Julie drives half the distance at 38.0 mph and half the distance at 62.0 mph. On her return trip, she drives half the time at 38.0 mph and half the time at 62.0 mph.

a. What is Julie's average speed on the way to Grandmother's house?

b. What is her average speed on the return trip?

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