Who is Faster?

Look for the escalator on the left of the museum Images of Singapore that leads to the Merlion.

The Distance-Time graph below shows a comparison between “walking down the escalator” and “walking down the stairs next to the escalator”.

Assuming that, in the above graph, the walking pace is about the same for both persons, add a line to the graph that would represent the distance versus time for a person who is standing still on the downward escalator.

*Hint: You and your group members may experiment on the escalator to find the answer.

Question source: PISA (Programme for International Student Assessment) survey.