Speed of boat in still water is 9km/h . if boat moves upstream A to B in 2 hrs. &
B to A in 1 hrs. Then find distance b/w A&B

• ans:12km
  Let speed of stream = s kmph
  distance be x
  for upstream
  (9-s)*2=x (speed*time=distance)
  for downstream
  (9+s)*1=x
  On solving we get x=12km
  
  
• 11 years agoHelpfull: Yes(14) No(3)
• let speed of stream be s km/hr
  distance be x
  upstream =(9-s)*2=x--------------1
  downstream=(9+s)*1=x--------------2
  (9-s)*2=(9+s)*1
  18-2s=9+s
  9=3s
  s=3
  substitute s=3 in eq 1we get distance from A to B X=12km
• 6 years agoHelpfull: Yes(2) No(0)
• 12 km
  we know that distance=time*speed
  d=2*speed of upstream(su)
  also 2*su=sd
  speed of boat in still water=(sd+su)/2=9 therefore sd+su=18 or sd=18-su
  thus 2*su=18-su; 3su=18; su=6
  so distance=2*6=12 km
• 7 years agoHelpfull: Yes(0) No(0)