Discussion
A path climbs from a contour marked 300 m to one marked 420 m over a ground distance of 1.2 km. What is its average gradient?
Answer: A
The rise is 120 metres over 1,200 metres of ground, which reduces to 1 in 10. Converting the distance to metres before dividing keeps the two quantities in the same unit, and forgetting to do so gives a gradient a hundredfold too gentle.
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