Two trains are headed towards each other on the same straight track, each having a speed of 30km/h. A bird that can fly at 60km/h flies off one train when they are 60km apart and leads directly for the other train. On reaching the other train, it flies back to the first train and so on. (a) How many trips can the bird make from one train to the other before they meet? (b) What is the total distance the bird travels.

Asked by ashish sharma | 24th May, 2012, 12:18: PM

Expert Answer:


Find the time when the two trains collide: 
 So the bird can fly back and forth for  before the trains collide.
So the total distance travelled by the bird should be 

Answered by  | 25th May, 2012, 06:57: AM

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