1 cm ------------- 40000000
7 cm -------------- x
x = 7.40000000
x = 280000000 cm
1 km -------- 100000 cm
x ------------- 280000000 cm
100000x = 280000000
x = 280000000/100000
x = 2800 km.
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1 cm ------------- 40000000
7 cm -------------- x
x = 7.40000000
x = 280000000 cm
1 km -------- 100000 cm
x ------------- 280000000 cm
100000x = 280000000
x = 280000000/100000
x = 2800 km.