An automobile travels for 90 minutes along a highway. The graph shows the progress of the automobile, with its start point designated as distance = 0 km.



As shown on the graph, at which two points does the automobile change speed?
points P and Q
points B and P
points A and B
points A and P

An automobile travels for 90 minutes along a highway The graph shows the progress of the automobile with its start point designated as distance 0 km As shown on class=


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