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:  Answers.
A) 2 Hours B) 3 Hours C) 4 Hours D) 1 Hour E) 5 Hours
Let the duration of the flight be x hours.   Then, 600/X - 600/(X +1/2) = 200 ==&gt; 600/X - 1200/(2X +1) = 200   ==&gt; X(2X + 1) = 3 (2  + 1)= 
<gadget id="calculator">(2  + 1)</gadget>
<output>3</output>
3==&gt; 2X sqr. + X - 3 = 0 ==&gt; (2X +3)(X - 1) = 0.   by neglecting negative value of X we got X = 1 hr.   Answer 1 Hour) 1 Hour.
<result>D</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: