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Knowing how long the journey took and the speed she travelled means you can work out the total distance they went.
Using this and the second piece of information, how far is it between D and E?
Investigate how this pattern of squares continues. You could measure lengths, areas and angles.
During the third hour after midnight the hands on a clock point in the same direction (so one hand is over the top of the other). At what time, to the nearest second, does this happen?
How far have these students walked by the time the teacher's car reaches them after their bus broke down?