Two trains

The train runs at speed v1 = 72 km/h. The passenger, sitting in the train, observed that a train long l = 75m in 3 s passed on the other track in the opposite direction. Calculate the speed of this train.

Correct result:

v2 =  18 km/h

Solution:

v1=72 km/h m/s=72/3.6  m/s=20 m/s l=75 m t=3 s  t=lv1+v2  v1 t+v2 t=l  v22=lv1 tt=7520 33=5 m/s  v2=v22 km/h=v22 3.6  km/h=5 3.6  km/h=18 km/h



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