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One-fourth of certain journey is covered at the rate of 25 km/h, one-third at the rate of 30 km/h and the rest at 50 km/h. Find the average speed for the whole journey.
- A. $$\frac{{600}}{{53}}$$ km/h
- B. $$\frac{{1200}}{{53}}$$ km/h
- C. $$\frac{{1800}}{{53}}$$ km/h
- D. $$\frac{{1600}}{{53}}$$ km/h
E. None of these
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