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A boat can travel with a speed of 15 km/hr in still water. If the speed of the stream is 6 km/hr, find the time taken by the boat to go 84 km downstream.
  • a)
    5 hours
  • b)
    4 hours
  • c)
    3 hours
  • d)
    2 hours
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A boat can travel with a speed of 15 km/hr in still water. If the spe...
Speed downstream = (15 + 6) km/hr = 21 km/hr.
Time taken to travel 84 km downstream = (84 ÷ 21) = 4 hrs.
Hence the correct option is B.
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