A man goes upstream for a distance of 10 km in 5 hrs. Another man goes downstream the same distance of 10 km in 3 hrs. what is the difference in speed of 2 men if the river speed is 0.5 kmph?
1) 1.56
2) 2.45
3) 2.3
4) 1.33

• 10/(x-.5) = 5 => x = 2.5
  
  10/(y+.5) = 3 => y = 2.84
  
  (x-y)= 2.83 - 2.5 = .33 km/h
• 10 years agoHelpfull: Yes(47) No(28)
• Sa=10/5=2
  Sb=10/3
  speed of rever=0.5
  then Sa=2-0.5=1.5
  Sb=10/3+0.5=3.8
  diff in speed=3.8-1.5=2.3 ans=2.3
  
• 10 years agoHelpfull: Yes(26) No(19)
• since only the diff b/w the speeds of the 2 men is asked the answer will be 1.33 ( 3.33-2= 1.33)
  
  if the speed dff in still water was asked the answer would be .33
• 10 years agoHelpfull: Yes(25) No(3)
• the speed of man(upstream)=10/5=2 kmph
  the speed of man(downstream)=10/3=3.33 kmph
  so difference in speed=3.33-2=1.33 kmph
  so,river speed is not required in tis case
• 10 years agoHelpfull: Yes(8) No(5)
• 10 km/5 hrs= 2 km/h
  10 km/3 hrs= 10/3 km/h
  since river speed is 0.5=1/2
  so 2+1/2=5/2
  thn (10/3)-(1/2)= 20-3/6= 17/6
  (17/6)-(5/2)=(17-15)/6= 2/6= 1/3= 0.33.
• 10 years agoHelpfull: Yes(7) No(5)
• dummy question answer is 0.33
• 10 years agoHelpfull: Yes(7) No(5)
• The ans is 0.33, so its absolutely a dummy question.
• 10 years agoHelpfull: Yes(6) No(6)
• 1.33 is the correct answer.
• 9 years agoHelpfull: Yes(4) No(1)
• up stream 10/5 = 2
  speed of stream is 0.5 then 2-0.5 = 1.5
  down stream 10/3 =3.333
  then 3.33+0.5 =3.833(Stream always follows down stream )
  the difference is 3.8333-1.5=2.3
• 9 years agoHelpfull: Yes(3) No(4)
• x- 0.5 = 10/5 = 2
  x = 2.5
  y+0.5 = 10/3
  y= 17/6
  y-x = .33 km/h
• 9 years agoHelpfull: Yes(3) No(0)
• for upstream-
  v1-0.5=10/5=2
  v1=2.5
  for downstrem-
  v2+0.5=10/3=3.33
  v2=2.83
  then diff-
  v2-v1=2.83-2.5=0.33 km/hr
• 10 years agoHelpfull: Yes(2) No(4)
• Upstream case:-
  10/(x-0.5)=5
  =>x=1.5
  Downstream case:-
  10/(y+0.5)=3
  =>y=2.83
  Now,
  y-x=2.83-1.5
  =1.33 (option 4) ans
• 9 years agoHelpfull: Yes(2) No(2)
• option 1) 1.56 2) 2.45
  
  3) 2.3 4) 0.33
  upstream=10/5=2km/h =(speed of man A-speed of river)
  downstream=10/3=3.33km/h=(speed of man B+speed of river)
  speed of river=0.5km/h
  then Speed of A=2+0.5=2.5km/h
  Speed of B=3.33-0.5=2.83km/h
  diff in speed=2.8-2.5= 0.33km/h
  Ans=0.33km/h
• 8 years agoHelpfull: Yes(2) No(0)
• 10/5=2
  10/3=3.33
  diff =>3.33-2=1.33
• 8 years agoHelpfull: Yes(2) No(0)
• in upstream speed of river will be reduced from speed of man and in downstream speed of river will be add to speed of man so answer will be 2.33 i.e. 3)2.3
• 10 years agoHelpfull: Yes(1) No(4)
• upstream ->10km and 5hrs
  so 1hr distance will be 2km/hr
  downstream->10km and 3hrs
  so 1hr distance will be 3.33km/hr
  speed of stream=1/2km/hr
  speed of 1st men =2-0.5=1.5
  speed of 2nd men=3.33+0.5=3.83
  difference b/w two men=3.83-1.5=2.3
  option:3
  
• 10 years agoHelpfull: Yes(1) No(4)
• let 1st person be x and second person be Y,
  relative velocity of x is u-v = 2kmph
  relative velocity of y is u+v =3.33kmph
  v=0.5kmph(given)
  speed of X is 2+0.5 =2.5
  speed of Y is 3.33- 0.5= 2.83
  difference between their speeds = 2.8 3- 2.5 =0.33
• 9 years agoHelpfull: Yes(1) No(2)
• actually the fourth option is wrong it should be 0.33
• 8 years agoHelpfull: Yes(1) No(0)
• x1-0.5=2,x2+0.5=10/3;then find the diffrnce bet x1 &x2
• 10 years agoHelpfull: Yes(0) No(0)
• its a correct question
  the relative velocity of first person is (2)-(0.5)=1.5
  the relative speed of second person is (3.33)+(0.5)=3.83
  the difference between speed is(3.83)-(1.5)=2.3
  answer is 2.3
• 10 years agoHelpfull: Yes(0) No(6)
• according to seesame ans is 1.56
• 9 years agoHelpfull: Yes(0) No(2)
• Resultant upstream speed = (speed of man) - (speed of river) ==> (10/ 5) - 0.5 = 1.5 km/h
  Resultant downstream speed = (speed of man) + (speed of river) ==> (10/ 3) + 0.5 = 3.33 km/h
  Hence,
  Difference in speed of two men = 3.33 - 1.5 = 2.33 km/h
• 8 years agoHelpfull: Yes(0) No(0)
• according to options river speed is not required in this question so answer is
  3.33-2=1.33.
• 8 years agoHelpfull: Yes(0) No(0)
• upstream speed =Distance/time
  =10/5=2 kmph
  downstream speed of =10/3=3.33kmph
  difference =3.33-2=1.33
• 7 years agoHelpfull: Yes(0) No(0)
• sa=10/5=2
  speed of river=0.5
  sb=10/3
  2-0.5=1.5
  10/3+1.5=10/3.5=2.83-1.5=1.33
• 7 years agoHelpfull: Yes(0) No(0)