Multiple choice

Liam drove a total distance of 100 miles. He drove m percent of the distance at an average speed of 50 miles per hour, and the remaining distance at an average speed of 80 miles per hour. In terms of m, where 0 ≤ m ≤ 100, what was Liam's average speed for the entire trip?

  1. 4,000 50 + 0.3 x

  2. 4,000 80 + 0.3 x

  3. 4,000 80 − 0.3 x

  4. 4,000 50 − 0.3 x

  5. 50 ( x 100 ) + 80 ( 1 − x 100 )
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