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The reduced levels (RLs) of the points P and Q are +49.600 m and +51.870 m respectively. The distance PQ is 20 m. The distance, in m, from P at which the +51.000 m contour cuts the line PQ is

1. 15.00
2. 12.33
3. 3.52
4. 2.27

Correct answer: 15.00

Solution

The contour level lies between the RLs of P and Q, so its position on PQ is found by proportional interpolation. The correct distance from P is 15 m, not 2.27 m, because the contour is much closer to Q than to P.

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