\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
A helicopter travels at a constant velocity. It is initially at position \(A(6, 9, 3)\), and 10 minutes later it is at position \(B(3, 10, 2.5)\). Distances are measured in kilometres.
  1. Find the velocity vector of the helicopter in km/h.
  2. Find the speed of the helicopter in km/h, correct to one decimal place.

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