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A map of a region is drawn to scale of 1cm to 100m. The diagram below is part of the map (reduced) showing contour lines

PQ is a straight path with a constant gradient of 1 vertically in 6 horizontally. Calculate

- The length of PQ as measured on the map
- The actual length of the path PQ, correct to the nearest 10m
- The angle of elevation of Q from P

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