Unit 9 · Speed and Time Calculation
Four Friends in a Car — Who Is Driving?
Lesson 7 of 9
About this lesson
Four friends in a car with two front seats and two back seats. Three constraints: Katelyn drives or sits beside Talia; Talia is behind the driver; Jimmy is not in the back and not beside Andrea. Who drives? The key is to try both interpretations of the first clue — one works, one creates an unavoidable contradiction with the third clue.
Chapters
Question
Four friends are in a car together.
There are two seats in the front and two in the back.
Katelyn is either driving or sitting beside Talia.
Talia is sitting behind the driver.
Jimmy is not sitting in the back, and he is not sitting beside Andrea.
Who is driving the car?
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