Swift fetch minutes per kilometer from seconds per meter

Question

I have an array of CLLocations each with the seconds per meter element. I want to calculate the run splits from that array (Minutes per kilometer). How can I fetch the minutes per kilometer for each kilometer from the CLLocations array?

This is how I am getting the locations below.

let query = HKWorkoutRouteQuery(route: route) { (_, locations, _, error) in
        if let error = error {
            print("There was an error fetching route data: ", error)
            return
        }

        guard let locations = locations else { return }
    }
    healthStore.execute(query)

Answer 1

CLLocationSpeed is defined as speed in meters per second, see Apple Docs

It is an alias for Double, so you can just translate it with:

let speedMS = location.speed
let speedKMM = speedMS * 3 / 50

You can use an extension for better code readability:

extension CLLocationSpeed {
    func toKmM() -> Double {
        return self * 3 / 50
    }
}

And when you want to get km/m, you just use CLLocation.speed.toKmM()

Edit:
And even simpler solution by @Leo Dabus, extend CLLocation:

extension CLLocation { 
    var kilometersPerMinute: Double { 
        speed * 0.06 
    } 
}