Two perpendicular rail tracks have two trains A & B respectively. Train A moves towards north with a speed of 54 km h –1 and train B moves towards west with a speed of 72 km h –1 . Assume that both trains start from same point. Calculate the
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20 m/s or 72 km/h due east
25 m/s or 90 km/h at 37°N of E 25 m/s or 90 km/h
Sol. V G,B = 0 – 20 = – 20 m/sec i.e., due east
V A = 15 m/sec V B = 20 m/sec 
= – 
tan θ = 
i.e., θ = 37º North of east 
= 25 m/sec.
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