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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:

Correct Answer: 1 hour

Explanation:

Let the duration of the flight be x hours.



Then, 600 - 600 = 200
x x + (1/2)



600 - 1200 = 200
x 2x + 1


x(2x + 1) = 3


⟹ 2x2 + x - 3 = 0


⟹ (2x + 3)(x - 1) = 0


x = 1 hr.      [neglecting the -ve value of x]


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