Which times on a digital clock have a line of symmetry? Which look
the same upside-down? You might like to try this investigation and
This investigation explores using different shapes as the hands of
the clock. What things occur as the the hands move.
Do you know the rhyme about ten green bottles hanging on a wall? If
the first bottle fell at ten past five and the others fell down at
5 minute intervals, what time would the last bottle fall down?
A bird flew north for $20$ minutes, north-west for $50$ minutes,
then south for $20$ minutes.
The bird keeps flying at about the same speed.
For how long, and in what direction, would the bird have to fly
to return to its starting point?