A train is moving with a speed of 40 km/h. As soon as another train going in the opposite direction passes by the window, the passenger of the first train starts his stopwatch and notes that other train passes the window in 3 s. Find the speed of the train going in the opposite direction if its length is 75 m
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50 km/h
Sol. d = 
where υ r is the relative velocity
120 + 3v = 270 3v = 150 v = 50 
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