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A car with $5$ tyres (four road tyres and a spare) travelled $30000 \;\text{km}$. All $5$ tyres were used equally. How many kilometres' wear did each tyre receive?
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.
If it takes four men one day to build a wall, how long does it take 60,000 men to build a similar wall?
If the sides of the triangle in the diagram are 3, 4 and 5, what is the area of the shaded square?