Question

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?

Answer 1

i know the answer is 60km.. but how to show??

Answer 2

so the bird start flying wen they are 60 km apart..

Answer 3

ya

Answer 4

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

Answer 5

relative speed.. if i'm in train A, i will see train B moving with 60km/h toward me...

Answer 6

yea nd that bird?

Answer 7

moving with 30km/h away frm me

Answer 8

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

Answer 9

half hour..meet at 30km position..

Answer 10

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...

Answer 11

well ok then