A man can row 6 km/hr in still water. If the speed of stream is 2km/hr, it takes him 3 hours to row to a place and back. How far is the place?

• speed in down stream=6+2=8km/hr
  speed in up stream=6-2=4km/hr
  speed=distance/time
  let Xkm be the required distance
  (x/8)+(x/4)=3
  this gives x=8kms
• 12 years agoHelpfull: Yes(59) No(0)
• downstream=6+2 = 8km
  upstream=6-2 = 4km
  
  avg speed =(2*8*4)/8+4
  avg speed = 5.33
  
  now distance be =x
  total distance in context with avg speed =2x
  
  speed = distance/time
  
  total time = 3hr
  
  5.33 = 2x/3
  x=8km.. :)
• 12 years agoHelpfull: Yes(8) No(3)
• speed down stream= 8 km/h
  up stream= 4km/h
  let distance be d km
  hence, d/8+d/6=3
  on solving d=8 km
  
• 12 years agoHelpfull: Yes(4) No(1)
• Y CANT BE IT LIKE THIS ANY ONE EXPLAIN
  8 AND 4 ARE THE SPEEDS SO CALCULATING ITS AVERAGE SPEED NOW ITS 16/3 KM/HR * TIME (3) SO WE GET 16KMS AS THE DISTANCE TOTAL TRAVELLED SO 16/2 IS THE ONE WAY
  IS THIS METHOD CORRECT ??
• 12 years agoHelpfull: Yes(3) No(6)
• qu. is asking about distance not about speed....
  
• 9 years agoHelpfull: Yes(0) No(0)
• Its should be 24kms.
• 8 years agoHelpfull: Yes(0) No(0)