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Google has done math in the search for a while. It is also my go to place for unit conversions.

But has it always done 3D? I was completely unaware!

apparently before 2013 as shown in this 'google boobs' video: https://www.youtube.com/watch?v=YQjNpFCjfKE

Speaking of which, miles per hour get converted in m/s, which is not very useful

Just tell it the output unit you want.

30 mph in km/h