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(52832) (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?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Answer. 45 km.
Solution
The trains pass each other in = = 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.
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