Two parallel rail tracks run north-south. Train A moves due north with a speed of 54 km h –1 and train B moves due south with a speed of 90 km h –1 . A monkey runs on the roof of train A with a velocity of 18 km/h w.r.t. train A in a direction opposite to that of A. Calculate the
Text Solution
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144 km/h due south
90 km/h due north
36 km/h due north
126 km/h due north
Sol. 
i.e., 40 m/sec due south = 144 km/hr due south
= 25 m/sec 
i.e., 25 m/sec due north = 90 km/hr due north
i.e., 10 m/sec due north. = 36 km/hr due north
i.e., 35 m/sec due north. = 126 km/hr due north
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