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A biard is at a point P(4m,-1m,5m) and s...

A biard is at a point `P(4m,-1m,5m)` and sees two points `P_(1) (-1m,-1m,0m)` and `P_(2)(3m, -1m,-3m)`. At time `t=0`, it starts flying in a plane of the three positions, with a constant speed of `2m//s` in a direction perpendicular to the straight line `P_(1)P_(2)` till it sees `P_(1)` & `P_(2)` collinear at time t. Find the time t.

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