In a flight of 2800km, an aircraft was slowed down due to bad weather. Its average speed is reduced by 100km/h and time increased by 30 minutes. Find the original duration of the flight.

Explanation

To solve the problem step by step, we will define the variables, set up the equations based on the information given, and then solve for the original duration of the flight.

### Step 1: Define Variables
Let:
- \( T \) = original duration of the flight in hours
- \( U \) = original average speed of the aircraft in km/h

### Step 2: Set Up the First Equation
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