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The time taken by a boat to travel 420 km upstream is equal to the time taken by the same boat to travel 540 km downstream. What is the speed of the boat in still water if the total time taken by the boat to travel 405 km downstream and 245 km upstream is 16 hours?
  • a)
    40 km/h
  • b)
    50 km/h
  • c)
    30 km/h
  • d)
    25 km/h
  • e)
    None of the above
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
The time taken by a boat to travel 420 km upstream is equal to the ti...
Let the speed of the boat in still water = m
Speed of the stream = s
Time taken by a boat to travel 420 km upstream is equal to the time taken by the boat to travel 540 km downstream.
From (1),
m = 8s
m = 8 x 5
m = 40
Speed of the boat in still water = 40 km/h
Hence, the correct answer is Option A
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The time taken by a boat to travel 420 km upstream is equal to the time taken by the same boat to travel 540 km downstream. What is the speed of the boat in still water if the total time taken by the boat to travel 405 km downstream and 245 km upstream is 16 hours?a)40 km/hb)50 km/hc)30 km/hd)25 km/he)None of the aboveCorrect answer is option 'A'. Can you explain this answer?
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