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The railway line from Lanzhou to Urumqi is about 1900km long. On the map of 1:40000000 scale, what is its length Let the length on the graph be xcm How to solve the problem? fast
Let the length on the graph be xcm
x：190000000=1:40000000
x：19=1:4
4x=19
x=4.75
The length is 4.75cm
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The railway line from Lanzhou to Urumqi is about 1900km long. On the map with a scale of 1:40000000, how long is it?
1900km*1/40000000
=190000000cm*1/40000000
=4.75cm
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On a map with a scale of 1:300000, the distance between a and B is 5cm. If the scale is changed to 1:200000, what is the distance between a and B? What is the actual distance?
Actual distance = 5 × 300000 = 1500000 cm = 15 km
1:200000
Distance on the map = 1500000 △ 200000 = 7.5cm
On a map with a scale of 1:200000, the distance between a and B is 2.5cm. What is the actual distance
rice
2.5cm × 200000
=500000 cm
=5km
A: the actual distance is 5km
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