Vector maths again! Please help!?

Question

at 12:00 helicopter A sets off from O with a velocity vector of
(72i + 96j) kmh^-1 and helicopter B sets off at 12:20 with velocity vector (144i+ 42j) kmh^-1. what are the position vectors of A and B at 13:00?

Answer 1

after 1 hour A moves by 72 units on the x-axis and 96 units on the Y-axis so it would be at 72i + 96j.

B moves for 40 min or 2/3 hours so it will be at 144(2/3)i + 42(2/3)j = 96i + 28j



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Answer 2

Helicopter A
Da = v t
Da = (72i + 96j) (1) = 72 i + 96 j

Helicopter B
Db = vt
Db = (144 i + 42 j) (2/3)
Db = 96 i + 28 j