GetSpeed = function (distance, time)
{
    return (distance / time) / 1000;
}
Calculate a per-ms speed from a distance and time (given in seconds).

@function Phaser.Math.GetSpeed
@since 3.0.0

@param {number} distance - The distance.
@param {number} time - The time, in seconds.

@return {number} The speed, in distance per ms.

@example
// 400px over 1 second is 0.4 px/ms
Phaser.Math.GetSpeed(400, 1) // -> 0.4