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Q:

The speed of the current is 5 km / hour. A motorboat goes 10 km upstream and back again to the starting point in 50 minutes. The speed (in km / hour) of the motorboat in still water is: 

  • 1
    20
  • 2
    26
  • 3
    25
  • 4
    28
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Answer : 3. "25 "

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