two planes belong to mirchi and green .Distance between two cities A and B is 2100km. wind blow from A to B. when races is with the wind mirchi beats green by 300km. when against the wind mirchi beats by 420km .find the ratio of their speeds when no wind blow ??

• 6:5
  
  Let the speed of the wind=x, Mirchi=M, Green=G kmph, then
  Along the wind, speeds of Mirchi & Green are (M+x) & (G+x) kmph.
  Against the wind, speed of Mirchi & Green are (M-x) & (G-x) kmph.
  
  According to 1st condition (Along the wind): the time in which Mirchi covers 2100 km, Green covers 1800 km.
  => 2100/(M+x) = 1800/(G+x) => x=6M - 7G ---(i)
  
  Similarly according ti 2nd condition (Against the wind) : the time in which Mirchi covers 2100 km, Green covers 1680 km
  => 2100/(M-x) = 1680/(G-x) => x=5G - 4M ---(ii)
  
  Equating (i) & (ii), 6M - 7G = 5G - 4M
  => 10M = 12G
  => M/G = 6/5
• 6 years agoHelpfull: Yes(24) No(0)
• 5/7
  
  300/420
• 6 years agoHelpfull: Yes(0) No(9)
• Speed of green 5
  ------------------------ = -----
  Speed of mirchi 6
  
  Let speed of mirchi be Sm
  Let speed of green be Sg
  Speed of wind be X.
  
  
  So according to the First Part
  2100 1800
  ----------------------- = -------
  Sm + X Sg+X
  
  
  According to the second part
  2100 1680
  ----------------------- = -------
  Sm - X Sg-X
  
  
  Solve this two equations and you'll get your answer.
• 6 years agoHelpfull: Yes(0) No(2)