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Q: A boat can travel 21 km in 3 hours going upstream. It can travel 55 km in 5 hours going downstream. What is the speed of the stream?
  • A. 2.5 km/h
  • B. 3 km/h
  • C. 3.5 km
  • D. 2 km/h
Correct Answer: Option D -
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Explanations:

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