(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I don't know how to start.. someone please give me a step-by-step explanation.

Julie drives 100 mi to Grandmother's house. On the way there she drives half of the distance at 42 mi/hr and half the distance at 68 mi/hr. What is Julie's average speed (in mi/hr) on the way to Grandmother's house?

2. Relevant equations

3. The attempt at a solution

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# How do I find the average speed for this problem?

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