A train leaves Los Angeles at 15mph heading for New York. Another train leaves 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?
Distance between NY and LA = d miles
Time taken for the trains to collide = d/(15+20) hours
Distance travalled by the bird in that time = (d/35)*25 = 5d/7
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