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 ground with respect to B in m/s? Choose the positive direction of x-axis to be from south to north.
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The answer is :
2x=90-54
2x=44
x=44/2
x=22
2x=90-54
2x=44
x=44/2
x=22
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