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Q:

A boat moves downstream at the rate of 1 km in $$7{1\over 2}$$ minutes and upstream at the rate of 5 km an hour. What is the speed of the boat in the still water?  

  • 1
    4 km/hour
  • 2
    3 km/hour
  • 3
    8 km/hour
  • 4
    $$6{1\over 2}$$ km/hour
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Answer : 4. "$$6{1\over 2}$$ km/hour "

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