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You drive on Interstate 10 from San Antonio to Houston, half the time at 76 km/h...

You drive on Interstate 10 from San Antonio to Houston, half the time at 76 km/h and the other half at 110 km/h. On the way back you travel half the distance at 76 km/h and the other half at 110 km/h. What is your average speed (a) from San Antonio to Houston, (b) from Houston back to San Antonio, and (c) for the entire trip? (d) What is your average velocity for the entire trip?

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