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A boat takes 40 minutes to travel 12 km downstream, when the speed of stream is 8 km/hr. What is the speed of the boat in still water?
  • a)
    2 km/hr
  • b)
    10 km/hr
  • c)
    18 km/hr
  • d)
    21 km/hr
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A boat takes 40 minutes to travel 12 km downstream, when the speed of ...
Downstream speed = distance/time = 12/(40/60) = 18 km/hr
∵ Downstream speed = Speed in still water + Speed of stream
∴ Speed of boat in still water = Downstream speed – Speed of stream = 18 – 8 = 10 km/hr
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A boat takes 40 minutes to travel 12 km downstream, when the speed of stream is 8 km/hr. What is the speed of the boat in still water?a)2 km/hrb)10 km/hrc)18 km/hrd)21 km/hrCorrect answer is option 'B'. Can you explain this answer?
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