datafield.mc

//! The given info object contains all the current workout
    //! information. Calculate a value and return it in this method.
    function compute(info) {
        // See Activity.Info in the documentation for available information.
		var minutesPerMile = 1 / (info.currentSpeed * 60 / 1609.34);
		var minutes = minutesPerMile.toNumber();
		var seconds = (minutesPerMile - minutes) * 60;
		if (seconds < 10) {
			seconds = "0"+seconds;
		} else {
			seconds = seconds.toNumber();
		}
		return minutes + ":" + seconds;
    }