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[" Problem "3.A" bird is at a point "P" ...

[" Problem "3.A" bird is at a point "P" whose coordinates are"],[(4m,-1m,5m)." The bird observes two points "P_(1)" and "P_(2)],[" having coordinates "(-1m,2m,0m)" and "(1m,1m,4m)],[" respectively.At time "t=0," it starts flying in a plane of three "],[" positions,with a constant speed of "5ms^(-1)" in a direction "],[" perpendicular to the straight line "P_(1)P_(2)" till it sees "P_(1)" and "P_(2)],[" collinear at time t.Calculate t."]

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