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Q:

A motorboat can travel at 10 km/hr. in still water it travelled 91 km downstream in a river and then returned taking at together 20 hours. Find the rate of flow of the river 

  • 1
    5 km/hr
  • 2
    8 km/hr
  • 3
    3 km/hr
  • 4
    6 km/hr
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Answer : 3. "3 km/hr"

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