In a flight of 600 km an aeroplane was slowed down due to a bad weather. If the average speed for the trip was reduced by 200 Km/h and the time of flight increased by 30 minutes, then the duration of flight is
(A) 1 hr
(B) 2 hrs
(C) 3 hrs
(D) 4 hrs
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Correct option is (A) 1 hr