An aeroplane started 30 minutes later than the scheduled time from a place 1800 km away from its destination. To reach the destination at the scheduled time the pilot increased the speed by 300 kmph. What as the speed of the aeroplane in kilometre per hour during the entire journey?
A. 1300 km/h
B. 1200 km/h
C. 1250 km/h
D. 1320 km/h
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