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58. Two trains A and B, are travelling towards each other. Train A moves with a uniform speed of 40 km/hr while
train B moves with a uniform speed of 30 km/hr. When the two trains are 210 kms apart, a bird flies to and fro
from train A to train B, then back to train A and then again to train B, and so on until the two trains meet. Find out
the total distance travelled by the bird, if it flies at a constant speed of 18 km/hr.
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