Refer to figure.
To determine the speed of the geostrophic wind at position 55°N 005°E:

• Begin by identifying position 55°N 005°E on the chart, which falls between the 1028 hPa and 1032 hPa isobars.
• Utilize a ruler to measure the distance between the 1028 hPa and 1032 hPa isobars at this location.
• Locate the geostrophic wind scale, usually found in the top left corner of the surface pressure chart.
• Commencing from the left side of the geostrophic wind scale, project the measured distance onto the 55°N latitude (between the 50°N and 60°N horizontal lines). You'll observe that the end of the measured distance falls slightly to the right of the 15 kt curved line. Therefore, we can deduce that the speed of the geostrophic wind at position 55°N 005°E is approximately 13 kt.

For determining the wind direction:

• At position 55°N 005°E, draw a straight line parallel to the closest 1028 hPa and 1032 hPa isobars. According to Buys Ballot's Law, in the Northern Hemisphere, the lower pressure is on our left when we have our back to the wind. Thus, we can conclude that the geostrophic wind at position 55°N 005°E is blowing from a true bearing of approximately 310°.

Based on the information and the available choices, we can see that correct answer must be 310°/15 kt. This is not an exact science due to the constraints of the measuring and also the movement of the isobars in this region.