Two cars $A$ and $B$ start at the same time. Their distance-time graphs are straight lines through the…

Two cars $A$ and $B$ start at the same time. Their distance-time graphs are straight lines through the origin, with $A$'s line steeper than $B$'s. Which car is faster?
  1. $A$
  2. $B$
  3. Both have the same speed
  4. Cannot be determined

Solution

Steeper slope on a distance-time graph means greater speed, so $A$ is faster.

Asked in: IMO

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