Originally Posted by

**massid** I feel like there are missing variables to this problem, which is where i'm getting stuck. I feel as if i might need to enter in dummy values to make the problem work?

You drive on Interstate 10 from San Antonio to Houston, half the *time* at 69 km/h and the other half at 97 km/h. On the way back you travel half the *distance* at 69 km/h and the other half at 97 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?