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.
A) 1 hour
B) 2 hours
C) 3 hours
D) 4 hours
E) 5 hours
Let the duration of the flight be x hours   600/x - 600 (x+1/2)= 200   600/x - 1200/(2x+1) = 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 can't be negative hence x=1   x = 1 hr.   Duration =1 hr   1 hourNSWER:1 hour
<result>A</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: