Much-Simpler

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace QuadraticEquationSolver
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter hour of takeoff:");
            int hour = int.Parse(Console.ReadLine());
            Console.WriteLine("Enter minutes of takeoff:");
            int mins = int.Parse(Console.ReadLine());
            Console.WriteLine("Enter flight duration in minutes:");
            int flightDuration = int.Parse(Console.ReadLine());
            mins += flightDuration;
            hour += mins / 60;
            mins %= 60;
            Console.WriteLine("Hours: " + hour + " Minutes: " + mins);
        }
    }
}