Calculate time to move between two points given an arbitrary speed

CalculateTime.swift

func getDuration(pointA: CGPoint, pointB: CGPoint, speed: CGFloat) -> TimeInterval {
    let xDist = (pointB.x - pointA.x)
    let yDist = (pointB.y - pointA.y)
    let distance = sqrt((xDist * xDist) + (yDist * yDist));
    let duration = TimeInterval(distance/speed)
    return duration
  }