what ARE THE SPEEDS OF two trains travels with 80 yards and 85 yards long respectively?assume that former is faster than lather
a)they take 75 secto pass eachother inoppp direction b)they take 37.5 seconds to pass each other in same direction

• Sorry friends this is my little correction to the previous solution....this is the correct one.
  
  let the speeds be x and y
  
  when moves in same direction the relative speed, x-y = 85-80/37.5 = 0.13 .....(l)
  
  when moves in opposite direction the relative speed, x+y = 165/75 = 2.2...(ll)
  
  now, equation l + equation ll gives, 2x = 0.13+2.2 = 2.33 => x=1.165
  
  from equation l, x-y=0.13 => y = 1.165-0.13 = 1.035
  
  therefore the speeds are 1.165 yards/sec and 1.035 yards/sec.
  
  
• 10 years agoHelpfull: Yes(28) No(10)
• I think this question is not correct as because passing in same direction always takes much time than passing in opposite direction.
• 10 years agoHelpfull: Yes(13) No(2)
• in opposite direction--
  their average speed would be=v1+v2=(80+85)/75 sec
  in same direction---
  their average speed would be= v2-v1=165/37.5=(165*2)/75 sec v2>v1
  
  now 2v2=3*165/75; v2=33/10=3.3 yards/sec
  v1=165/750=1.1 yards/sec
  
  
  ok though the question is wrong but the process would be like this.
• 10 years agoHelpfull: Yes(13) No(2)
• let the speeds be x and y
  
  when moves in same direction the relative speed, x-y = 85-80/37.5 = 0.13 .....(l)
  
  when moves in opposite direction the relative speed, x+y = 165/75 = 2.2...(ll)
  
  now, equation l + equation ll gives, 2x = 0.13+2.2 = 2.33 => x=1.165
  
  from equation l, x-y=0.13 => y = 1.165-2.33 = 1.035
  
  therefore the speeds are 1.165 yards/sec and 1.035 yards/sec.
  
  
• 10 years agoHelpfull: Yes(3) No(7)
• 3.3y/s & 1.1y/s
• 10 years agoHelpfull: Yes(3) No(0)
• I have a doubt
  When the trains are in opp direction they meet in less time than in same direction
  Can any one explain me....thank u in advance
• 9 years agoHelpfull: Yes(2) No(0)