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A man rows 12 km in 5 hours against the stream and the speed of current being 4 kmph. What time will be taken by him to row 15 km with the stream ?
  • a)
    1 hour 
  • b)
    1 hour 
  • c)
    1 hour 
  • d)
    1 hour 
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
A man rows 12 km in 5 hours against the stream and the speed of curren...
Speed of current 'y' = 4 km/h Distance=12 km
Speed in upstream=(x-y) km/hr.
Here 'x' is speed of boat in still water

5x–20=12
5x=32
x=6.4 km/hr.
Speed in downstream =(x+y)=6.4+4=10.4 km/h
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Most Upvoted Answer
A man rows 12 km in 5 hours against the stream and the speed of curren...
Speed of current 'y' = 4 km/h Distance=12 km
Speed in upstream=(x-y) km/hr.
Here 'x' is speed of boat in still water

5x–20=12
5x=32
x=6.4 km/hr.
Speed in downstream =(x+y)=6.4+4=10.4 km/h
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