The tallest

The tallest building in the world used to be Taipei 101 in Taiwan. Its height is 0.509 km. The tallest building in North America used to be Sears Towers in Chicago, USA. Its height is 0.442 km. What is the difference in the heights of the buildings?

Correct result:

x =  67 m


a=0.509 km m=0.509 1000  m=509 m b=0.442 km m=0.442 1000  m=442 m  x=ab=509442=67 m

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