Two trains are travelling between two stations at a constant speed of 25kmph.The stations are 50km apart .A bird traveling at 100kmph starts its flight along with one train and travels in the same direction until it meets the other train. It changes its direction and goes in the reverse direction until it meets the initial train. Find the distance travelled by the bird before the two trains collide.

• trains will travels 1 hr to meet each other
  in 1 hr bird will travel=100kms
  so will be 100kms..
• 10 years agoHelpfull: Yes(11) No(12)
• very funny!!!!!
  
• 10 years agoHelpfull: Yes(8) No(3)
• 100 km
  as the traviling at 25 kmph so they will collide at 25 km after 1hr
  in 1 hr bird travels 100*1= 100
• 10 years agoHelpfull: Yes(4) No(5)
• 100 km is the answer because two trains meet after an hour so in one hour bird travels 100 km so 100 km is the answer
  
  
• 10 years agoHelpfull: Yes(3) No(2)
• distance between two station is 50
  first train and bird start with speed of 25km/hr and 100km/hr
  the bird will meet second train t=50/(100+25)=0.4 hr
  in 0.4 hr the both trains had moved 0.4*25=10 means both trains moved 20 km
  than distance b/w first train and bird is 30 so time taken to meet first train is t=30/(100+25)=0.24
  time for travel the bird is 0.4+0.24=0.64
  distance = 0.64*100=64 km
  ans is 64
  if any thing is wrong tell me
• 10 years agoHelpfull: Yes(3) No(7)
• train will collide after 1 hour because,both trains speed are same i.e 25km/hr
  distance travelled by in 1hr by bird=1*100= 100 kms Ans..
  
  
• 10 years agoHelpfull: Yes(1) No(5)
• Find the time elapsed when trains collide (t)
  25t + 25t = 50
  50t = 50
  t = 1 hr until collision
  :
  Find how far the bird flies in 1 hr at 100 km/hr, obviously, 100 km for the bird
  
• 10 years agoHelpfull: Yes(1) No(0)
• train and bird is travelling in same direction.so, relative speed is (100-25)=75 kmph.
  and again it comes in reverse direction and it(bird) is travelling in same direction with other train.
  here reltive speed is also 75 kmph w.r.t. other train..
  so, how can all r tellng it travels 100km??????
  anyone can explain it clearly
  
  
• 10 years agoHelpfull: Yes(1) No(0)
• (100 )mph = 100* 1.6 kmh=160kmh
  160+25=185 km in 1 hour
  1 km in 1/(185)
  50 km in 50/(185) =10/37 hr
  so in this 15 min bird travelled 160*(10/37)= 43.24 km-------------------(1)
  in this 15 min both the train travelled 6.75 km each...
  for both train after 15 min distance b/w dem is 50-(6.75+6.75)=36.50
  so now....(25+25)=50 km in 1 hr
  1 km in 1/(50)
  36.50 km in 36.50/ 50 = 0.72 hour
  
  bird travells 1 hour --------------160 km
  .72 hr ----------------160*.72 = 116.75km--------------------------------(2)
  add (1)+ (2 ) = 160 kmmmmmmmmmmmmmmmm....................bird travelledddddddddddd
• 10 years agoHelpfull: Yes(0) No(17)
• the bird travels from one train to another train with the speed of the 125kmph(100+25) then bird trains will travel to meet takes 1hr time. So the distance covered by the bird is also 125kmph
• 10 years agoHelpfull: Yes(0) No(3)
• Find the time elapsed when trains collide (t)
  25t + 25t = 50
  50t = 50
  t = 1 hr until collision
  :
  Find how far the bird flies in 1 hr at 100 km/hr, obviously, 100 km for the bird
• 10 years agoHelpfull: Yes(0) No(0)