A man wishes to cross a stream perpendicularly. In still water he takes 4 minutes to cross the river, but in flowing stream he takes 5 minutes. if the stream is 100m wide the velocity of flowing water of the stream is
a)25m/s
b)20m/s
c)15m/s
d)10m/s

• 15m/min
  He takes 100m. in still water(speed of man = 100/4=25m/min.) and he will take 125m.(25*5) in flowing stream. Since sqrt(sq(125)-sq(100))=75m. , ans=75/5 m/min
• 10 years agoHelpfull: Yes(11) No(9)
• 5m/s
  100/4=25m/s=vel of man
  100/(25-x)=5
  i.e x=5m/s
• 10 years agoHelpfull: Yes(1) No(2)
• incrrect question.... the vertical component of velocity is always constant,
  vertical distance is always 100m ..
  time taken should be 4min for all cases
• 10 years agoHelpfull: Yes(1) No(0)
• 20m/s
  since velocity of flowing water i.e. its speed which will be equal to length of stream divided by time taken in flowing stream viz 100/5=20 m/s
• 10 years agoHelpfull: Yes(0) No(25)