anonymous
  • anonymous
Two trains, each having a speed of 30 km/h, are headed at each other on the same straight track. A bird that can fly 60 km/h flies off the front of one train when they are 60 km apart and heads directly for the other train. On reaching the other train, the bird flies directly back to the first train, and so forth. What is the total distance the bird travels before the trains collide?
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
i know the answer is 60km.. but how to show??
anonymous
  • anonymous
so the bird start flying wen they are 60 km apart..
anonymous
  • anonymous
ya

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anonymous
  • anonymous
ok let's do it the smart way.......if u r sitting on the first train and u see the second train........wat wud be it's speed? like rate f approach r wateva
anonymous
  • anonymous
relative speed.. if i'm in train A, i will see train B moving with 60km/h toward me...
anonymous
  • anonymous
yea nd that bird?
anonymous
  • anonymous
moving with 30km/h away frm me
anonymous
  • anonymous
yea.....so u got a train 60 km away nd moving towards u @ 60 kmph and a damn bird moving away @ 30kmph........so u wanna find wen that bird reaches the train
anonymous
  • anonymous
half hour..meet at 30km position..
anonymous
  • anonymous
i think i get the idea ald.. thx a lot A.Avinash... just using the relative speed of both train n bird toward me.. n i look like resting.. thn i use the total time for calc the actual distance of the bird...
anonymous
  • anonymous
well ok then

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