The speed of the boat in the still water is 15km/h. It takes 4 hr 30 minutes to travel 30 km down the stream and back to the starting point. Find the speed of the stream.

• 5km/h
  let the speed of stream be x
  (30/(15+x))+(30/(15-x)=9/2
  x=5
• 11 years agoHelpfull: Yes(1) No(0)