two trains a and b are travelling towards each other train a moves with a uniform speed of 40 km per hour while train b moves with a uniform speed of 30 km per hour when the two trains are 210 km apart a bird flies to and fro from train a 220 then back to train a and then again to train b and so on until the two trains meet find out the total distance covered by the bird if it flies at a constant speed of 18 km per hour.
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18 km/hr is the answer that is correct
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