The slope of the line would decrease.
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if the speed is zero then the distance versus time line will be horizontal
Yes. Speed is the rate at which distance changes over time. In calculus terms v = dx/dt, or the slope of the distance vs. time graph. If the slope of the distance vs. time graph is a straight line, the speed is constant.
If you are plotting distance versus time it is a straight line with slope 300000
the slope would be speed.
The slope of the speed-vs-time graph is the magnitude of acceleration.