Total distance and total time.
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I'm sure that average speed would be easier to calculate than instantaneous speed. To calculate average speed, just take the time that it takes to travel between two points, and divide that into the distance between the points.
x and y
To calculate the area between the x-axis and a line (which may be straight or curved), between two values of x, you first need to find the equation of the line. You then integrate the equation between the limits (the two values of x.
Wave speed is the distance a wave travels in a given period of time. Frequency is the number of oscillations in a given period of time. The third leg of the triangle is wavelength--the distance between peaks of the wave. Given any two of these values for a wave, you can calculate the third.
Miles per hour or kilometers per hour