A scatter diagram.
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A scatter diagram. A line diagram will not be as good at showing a relationship that is non-linear (not a straight line).
No, it is quantitative.
The answer depends on the nature of the variables: for a start, whether they are qualitative or quantitative.
The answer depends on what sort of variables the data are (qualitative, quantitative-discrete, quantitative-continuous are; the nature of the relationship (if any) between the data sets; how much information you wish the graph to convey and how much you would prefer to describe in the accompanying text.
The shape and slope of the line on a graph illustrates the qualitative and quantitative relationship between the variables plotted on the axes of the graph. Sadly, there is no such graph as a "speed or time" one.