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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?
Then give out the problem and suggest that the children act it out in pairs before recording it on grid paper.
What sort of drawing might help?
Some children will find the speed/distance complexity difficult. Reword the question as: A bird flew north for $20$ km, north-west for $50$ km, then south for $20$ km. How far, and in what direction would the bird have to fly to return to its starting point?