Use the following information to calculate the gradient of River X. If the vertical change is 10 meters in 1 kilometer, then the gradient expressed in m/km is: 
Definitions:
Activity Stream
A real-time list or feed of actions or updates indicating what is happening within a network, service, or application.
Return On Emotion
An assessment of the emotional engagement and reactions elicited from target audiences by marketing campaigns or consumer interactions.
Dunbar's Number
A theoretical cognitive limit to the number of people with whom one can maintain stable social relationships, proposed to be around 150.
API
Application Programming Interface, a set of rules, routines, and protocols that allows software applications to communicate with each other.
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