Rating speeds from least to greatest from a position time graph

[Ineedhelpwithphysics]

Homework Statement

(E) Rank the values of the particles speed at points P, Q, R, S from fastest to slowest

Relevant Equations

Speed = distance/time

My answer is R > P > Q = S

Since R is more steeper than P the speed is greater, speed is a non-negative unit so i assume that speed of R will be greater than P
Speed of P has a positive slope, also the magnitude is positive.
Q and S are the same due to the fast that they both horizontal slopes which means the object is not moving which means no speed.

This is my work , correct me if i'm wrong, thanks ^^^

 

[kuruman]

Ranking and explanations look good.