The speed of a boat in still water is 11km/hr. It can go 12km upstream and return down stream to the engine point in 2 hours 45 minutes. What is the speed of stream?

• speed of stream = 5 km/hr
  If x is speed of stream, then
  12/(x+11) + 12/(11-x) = 11/4
  
  solving this , we get , x= 5 kmph,
  Then upstream time = 12/6 = 2 hr
  downstream time = 12/16= 3/4 hrs
• 13 years agoHelpfull: Yes(4) No(2)
• 5 km/hr
  
  
  
  
  
  
• 11 years agoHelpfull: Yes(0) No(0)