A man goes upstream for a distance of 10 km ni 5 hrs. Another man goes downstream the same distance of
10 kms in 3 hhs. what is the differenece of speed of 2 men if the river speed is 0.5 kmph’

options are
2.45/1.33/2.3/1.56

• 10km/5hrs=2km/h
  10km/3hrs=10/3km/h=3.33km/hr
  river speed=0.5
  so speed of the man going upstream =2+.5=2.5 & speed of the man going downstream = 3.33-0.5=2.83
  so difference of speed=2.83-2.5=0.33
• 9 years agoHelpfull: Yes(14) No(28)
• 0.5+x for down stream
  0.5 -x for up stream
  
  So s=d/t
  0.5+x=10/3......(1)
  0.5-x=10/5.......(2)
  Solving 1 and 2 eq. We get x =17/6
  And x = 3/2
  Difference of both is 1.33.
  Ans is 1.33
• 9 years agoHelpfull: Yes(13) No(7)
• In upstream resultant speed=2-0.5=1.5kmph
  In down stream resultant Speed=3.33+0.5=3.83kmph
  difference of speeds=2.35kmph
• 9 years agoHelpfull: Yes(8) No(2)
• b)1.33
  
  Time =Distance/Speed
  so here,
  1st step
  T(up_stream)=Distace/(x-y)
  5=10/(x-0.5)
  5x-2.5=10
  x=1.50
  2nd step
  3=10/(x-0.5)
  3x-1.5=10
  x=2.83
  so diff in speed of two men is 2.83-1.50=1.33
• 9 years agoHelpfull: Yes(4) No(3)
• it is a dummy question
• 9 years agoHelpfull: Yes(2) No(1)
• options are nt right... dummy question
• 8 years agoHelpfull: Yes(2) No(1)
• ans are not correct it should be 0.33
  for downstrm speed (10-(.5*3))/3=2.83
  for upstrm (10+(.5*5))/5=2.50
  so diff= 0.33
  
• 8 years agoHelpfull: Yes(2) No(2)
• as man A speed is 10/5 kmph i.e 2 kmph.........man B speed is 10/3=3.33 kmph.......then diffenece of speed of two man is 1.33
• 9 years agoHelpfull: Yes(1) No(6)
• Let speed of boat in which man is sitting is X
  And speed of river is Y
  So, upstream speed=dist/time =10/5=2
  Downstream speed =10/3= 3.33
  So The man who is going upstream with the speed of river 0.5 =2-0.5=1.5
  The man who is going upstream with the speed of river 0.5 =X+Y(speed of river)=3.33+.5=3.83
  Difference is =3.83-1.5=2.33
• 7 years agoHelpfull: Yes(1) No(0)
• it is a dummy question
• 5 years agoHelpfull: Yes(1) No(0)
• 1.3 is the ans
• 9 years agoHelpfull: Yes(0) No(1)
• How many dummy questions will be asked...? If anybody knows it please share...
• 8 years agoHelpfull: Yes(0) No(1)
• Given,
  Speed of the current (v) = 0.5 km/hr
  Distance (d) = 10 km
  Time (for 1st traveler) = 5 hrs
  Time (for 2nd traveler) = 3 hrs
  
  Let speed of boat upstream (1st traveler) = u km/hr
  Let speed of boat downstream (2nd traveler) = w km/hr
  
  1st traveler rows upstream (i.e. against the current)
  Therefore, his speed = u - 0.5
  Also, this speed = 10 / 5 = 2 km/hr
  
  Thus, u - 0.5 = 2
  u = 2 + 0.5 = 2.5 km/hr .......... (i)
  
  2nd traveler rows downstream (i.e. towards the current)
  Therefore, his speed = w + 0.5
  Also, the speed = 10 / 3 km/hr
  
  Thus, w + 0.5 = 10 / 3
  w = 2.83 km/hr .......... (ii)
  
  Difference between (i) and (ii) :
  2.5 ~ 2.83 = 0.33 km/hr .......... (Answer)
• 5 years agoHelpfull: Yes(0) No(0)