35. [ Two parallel rail tracks run north-south. Train A moves north with a speed of 54 km/hr, and train B moves south with a speed of 90 km/hr. What is the velocity of B with respect to A in m/sec? Choose the positive direction of x-axis to be from south to north.
a) -40.0
b) -55.0
C) -30.0
d) -45.0
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