Two trains each of having the speed of 30 kilometre per hour are headed at each other in opposite direction on the same track. a bird flies off one train to another with a constant speed of 60 kilometre per hour when they are 60 kilometre apart till before they crash. find the distance covered by the bird and how many trips the bird can make from one train to the other before they crash.



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Two trains are on the same track a distance 100 km apart heading towards one another, each at a speed of 50 km/h. A fly starting out at the front of one train, flies towards the other at a speed of 75 km/h. Upon reaching the other train, the fly turns around and continues towards the first train. How many kilometers does the fly travel before getting squashed in the collision of the two trains?math - Reiny, Sunday, December 7, 2014 at 9:36pmSo the distance between the two trains is changing at a rate of 100 km/h, (the sum of their speeds) 
so it will take them 100/100 or 1 hour to collide. 

In the meantime, the fly is merrily flying back and forth at 75 km/h, so in the 1 hour it would have simply traveled 75 km. 

Notice we ignored the fact that the fly has to decelerate and accelerate at each turn.
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