In a flight of 600 km, an aircraft was slowed down due to bad weather. Its average speed for the trip was reduced by 200 km/hr and the time of flight increased by 30 minutes. The duration of the flight is?	Select the correct option:
A) 3 hr
B) 2 hr
C) 1 hr
D) 4 hr
E) 5 hr
600/x - 600/(x + 1/2) = 200   x(2x + 1) = 3 2x2 + x - 3  (2  + 1)= 
<gadget id="calculator"> (2  + 1)</gadget>
<output>3</output>
3 2x2 + x - 3= 0   (2x + 3)(x - 1) = 0   x = 1 hr.   ANSWER 1 hr
<result>C</result>
In a flight of 600 km, an aircraft was slowed down due to bad weather. Its average speed for the trip was reduced by 200 km/hr and the time of flight increased by 30 minutes. The duration of the flight is?