SOLUTION: two trains 150 km apart travel toward each other on parallel tracks, each moving at 25 km/hr. A bird flies back and forth between the trains at 15 km/hr until the trains pass each

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Question 1039047: two trains 150 km apart travel toward each other on parallel tracks, each moving at 25 km/hr. A bird flies back and forth between the trains at 15 km/hr until the trains pass each other. How far does the bird fly?
Answer by ikleyn(52817) About Me  (Show Source):
You can put this solution on YOUR website!
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two trains 150 km apart travel toward each other on parallel tracks, each moving at 25 km/hr.
A bird flies back and forth between the trains at 15 km/hr until the trains pass each other. How far does the bird fly?
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Answer. 45 km.

Solution

The trains pass each other in 150%2F%2825%2B25%29 = 150%2F50 = 3 hours.

The bird flies 15*3 = 45 km during this time.


It is well known old joking problem.
Well-known for more than 100 years.

Ha-ha-ha.