Mathematics Quizzes Speed Time And Distance

Question:
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?

Option A):
45min
Option B):
1hr
Option C):
2hr
Option D):
3hr

Correct Answer is Option B):
1hr