101. 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:

✅ The correct answer is option A.
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
2×2 + x – 3 = 0
(2x + 3)(x – 1) = 0
x = 1 hr.      [neglecting the -ve value of x]