One train leaves Los Angeles at 15mph heading for New York.
Another train leaves from New York at 20mph heading for Los
Angeles on the same track. If a bird, flying at 25mph,
leaves from Los Angeles at the same time as the train and
flies back and forth between the two trains until they
collide, how far will the bird have traveled?
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Answer Posted / charkilah
There are two answers. (1) The total distance flown by the
bird back and forth, and (2) the distance from where the
bird left and where the trains collide. It is difficult to
guess from the wording which answer they are asking for.
Either way the answer is fairly straightforward.
1). The distance from L.A. when the trains collide is:
15/(15+20) = 3/7D where D is distance from LA to NY
2). The time it takes to get to this point can be
multiplied times the speed of the bird to get total
distance.
(3/7D)/15 X 25 = 5/7D
Good luck in your interview
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