Scale of the map

The distance between two cities is actually 30 km and the map is 6 cm. What is the scale of the map?

Correct result:

M =  500000

Solution:

a=6 cm→ m=6/100  m=0.06 m b=30 km→ m=30⋅ 1000  m=30000 m  M=ba=300000.06=500000=5.000000⋅105  M1:500000

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