First, the specified scale should be converted from centimeters to kilometers.
Since 1 km = 100,000 cm, we get:
200000/100000 = 2 km in 1 cm.
In order to find the true value of the distance, the length of the segment AB, namely 15 cm, should be multiplied by the resulting scale in kilometers.
15 * 2 = 30 km.
The true distance is 30 km.
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