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An aeroplane flying 1000 km covers the first 200 km at the rate of 200 km/hr, the second 200 km at 400 km/hr, the third 200 km at 600 km / hr & last 200 km at the rate of 800 km/hr. Determine the aver
- A250 km/hr
- B300 km/hr
- C480 km/hr
- D600 km/hr
Correct answer: C