what the heck is "due northwest of 30°" ?
due northwest is northwest -- no 30° involved
same for the other.
Did you mean a heading of N 30° W and N 60° E ?
In any case, plot the vectors, get the x- and y-components (using sine and cosine)
then add the components and use the distance formula as usual.
An aircraft travelled from Calabar to Kano as follows. It first flew to illorin with a distance 300km due North west of 30degrees and then moved to kano with a distance of 400km due North East of 60degrees. Calculate the resultant displacement of the aircraft.
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