Everyone knows Google's known for it's tough interview questions, but this one has an elegantly simple soultion. With a little bit of number sense and some high-school geometry, you'll be able to solve this in no time flat!
Music:
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Morning Station by Tokyo Music Walker
https://soundcloud.com/user-356546060
Creative Commons — Attribution 3.0 Unported — CC BY 3.0
Free Download / Stream: https://bit.ly/morning-station
Music promoted by Audio Library