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Q.) Two trains each travelling with a speed of 37.5 km/h are approaching each other on the same straight track. A bird that can fly at 60 km/h flies off from one train when they are 90 km apart and heads directly for the other train. On reaching the other train it flies back to the first and so on. Total distance covered by the bird is
[A]90 km
[B]54 km
[C]36 km
[D]72 km