using System;
using System.Globalization;
 
namespace Program
{
    class Program
    {
        static void Main(string[] args)
        {
            string BreakOut= "10:15 Minutes";
            string BreakIn = "10:30 Minutes";
 
            BreakOut = BreakOut.Split(new string[]{" "},
                StringSplitOptions.RemoveEmptyEntries)[0];
            BreakIn = BreakIn.Split(new string[] { " " },
                StringSplitOptions.RemoveEmptyEntries)[0];
 
            var ts1 = TimeSpan.Parse(BreakOut, CultureInfo.InvariantCulture);
            var ts2 = TimeSpan.Parse(BreakIn, CultureInfo.InvariantCulture);
 
            var difference = ts2 - ts1;
            Console.WriteLine("{0} minutes", difference.TotalMinutes);
        } 
    }
}

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