Let the original average speed of the aircraft be $x$ km/h, and the original time of flight be $t$ hours.

Step 1: Set up equations

• The distance of the flight is 600 km.
• Original speed: $x$ km/h.
• The original time of flight would be:

$t = \frac{600}{x}$

• The reduced speed due to bad weather is $x - 200$ km/h.
• The new time of flight is increased by 30 minutes (or ( \