A man can row downstream at the rate of 36 meters per second and upstream at the rate of 5 kmph. Find the speed of current.
option
(a) 2.8 kmph
(b) 3 kmph
(c) 2.5 kmph
(e) None of these

• if the question is ok.
  Then speed of in upstream is 129.6kmph.
  now let speed of man=x and streem=y.
  therefore, x+y=129.6(equn 1) for upstream and x-y=5(equn 2) for down stream.
  now from equn 2 x=5+y.
  put x in equn 1 2y=124.6
  y=62.3kmph. which is the speed of current.
  so option (e) is correct.
• 10 years agoHelpfull: Yes(12) No(3)
• (36*18/5-5)/2=62.3
• 10 years agoHelpfull: Yes(5) No(3)
• option e:
  speed of stream= 1/2(down rate-upstream rate)
  down rate =36m/s
  up rate= 5*(5/18)=1.38m/s
  so
  1/2(36-1.38)=17.31m/s or 17.31*(18/5)=62.31 kmph
  so correct ans is option e
• 10 years agoHelpfull: Yes(2) No(1)
• rate of Down stream= u =36*5/18=10kmph
  rate of up stream =v =5kmph
  Speed of current = 1/2[u-v] = 1/2[10-5]=2.5 kmph
• 10 years agoHelpfull: Yes(2) No(1)
• d).none..
  b+c=36
  b-c=1.38
• 10 years agoHelpfull: Yes(1) No(5)