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A student wanted to drive from Austin to San Antonio, 80 miles south of Austin on highway I35.

A student wanted to drive from Austin to San
Antonio, 80 miles south of Austin on highway
I35. Unfortunately, he entered the highway in
the wrong direction and drove all the way to
Waco — 100 miles north of Austin — before
he noticed his error. In Waco, he turned
around, drove back to Austin and continued
to San Antonio. The whole trip took 5.76 h.
What was the student’s average speed dur-
ing this trip?

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