Think of two cars on a road: if car Q covers more distance than car P during the same 10-minute interval, car Q must be moving at a higher speed than car P.

Slope = Speed; Steep = Swift.

The speed of an object in uniform motion is defined as the rate of change of distance, given by $v = \frac{ds}{dt}$. Graphically, this corresponds to the slope ($m$) of the distance-time plot, where $m = \tan(\theta)$. A steeper line (greater angle with the time axis) indicates a higher value of $\tan(\theta)$, directly corresponding to a higher uniform velocity.

Always check the axes labels; if the graph were velocity-time, the slope would represent acceleration, not speed!