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1. A motorboat, whose speed in 15 km/hr in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes. The speed of the stream (in km/hr) is:
- A. 4 km/hr
- B. 4 km/hr
- C. 4 km/hr
- D. 4 km/hr
Answer: Option B
Explanation:
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