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Nirmala and Riki live in different villages.
Both villages are $9$ kilometres away from the nearest market.
Nirmala rides her bike at $6$ kilometres per hour and Riki rides his
at $4$ kilometres an hour.
They both want to arrive at the market at exactly noon.
What time should each of them start riding?
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 find out!
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?