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Q: A boat, whose speed in still water is 15 km/hr. goes 30 km in the downstream in 4.5 hours and returns in the upstream. Find the speed of the stream.
  • A. 4 km./hr.
  • B. 5 km./hr.
  • C. 10 km./hr.
  • D. 6 km./hr.
Correct Answer: Option B -
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Explanations:

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