Two planes, A and B, are flying at the same altitude. Their
velocities are v_(A)=500k(m)/(h) and v_(B)=770k(m)/(h) such
that the angle between their straightline courses is \theta =60\deg .
(Figure 1)
Determine the magnitude of the velocity of plane B with respect to plane A.
Express your answer in kilometers per hour to three significant figures.
k(m)/(h)
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Part B
Figure