Please I need examples on using 111km in calculating the actual distance on ground when the map distance and scale is given

Do it yourself

Find your scale. Maps have different scales e.g. for an explorers map 1:25,000.

Measure distance on map say in centimetres.

Use a ruler, string, or almost anything, pencil, fingers, a twig or I like a spare piece of paper.

Place against the scale for a direct reading.

Or calculate distance.

Say you measure 4 cm on the map. Then remember in this case 1:25,000.

so 4x1 or 4 = 4x25,000 = 100,000 cm real or actual distance.

In meters divide by 100 = 100,000/100 = 1,000 metres. (= 4cm on map).

or in kilometres divide again by 1,000 = 1,000/1,000 = 1 Kilometre. (= 4cm on map).

Also a tip just proved: 1:25,000 is the same as 4 cm = 1 Km or 1 cm = 1/4 Km real.

And best for walking a 1:50,000 scale map 2 cm = 1 Km or 1 cm = 1/2 Km real.

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