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Q:

The speed of a boat in still water is 10 km/hr. It covers (upstream) a distance of 45 km in 6 hours. The speed (in km/hr) of the stream is : 

  • 1
    3.5 km/h
  • 2
    4 km/h
  • 3
    2.5 km/h
  • 4
    3 km/h
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Answer : 3. "2.5 km/h "

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