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 Choose the correct choice from the following
A) 3 hr.	B) 5 hr.	C) 2 hr.	D) 7 hr.	E) 1 hr.
E   1 hr.   Let the duration of the flight be x hours.   Then, 600/x - 600/0.5x = 200   --&gt; 600/x - 1200/(2x+1) = 200   --&gt; x(2x + 1) = 3   --&gt; 2x^2 + x - 3 (2  + 1)= 
<gadget id="calculator">(2  + 1)</gadget>
<output>3</output>
3   --&gt; 2x^2 + x - 3= 0   --&gt; (2x + 3)(x - 1) = 0   --&gt; x = 1 hr.
<result>E</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