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Four vehicles travelled on a road. What can you deduce from the times that they met?

### There and Back

Brian swims at twice the speed that a river is flowing, downstream from one moored boat to another and back again, taking 12 minutes altogether. How long would it have taken him in still water?

### Escalator

At Holborn underground station there is a very long escalator. Two people are in a hurry and so climb the escalator as it is moving upwards, thus adding their speed to that of the moving steps. ... How many steps are there on the escalator?

# Motion Sensor

##### Stage: 4 Challenge Level:
Moving between representations is a key area of capability in mathematics.

This problem rests on the student visualising the motion from a graphical expression of the distance-time data.

Asking for a result in units other than those given on a graph scale involves a little problem solving but mostly relies on an ability to see the same quality (speed) expressed in more than one way (m/s or mph)