two trains are running at a speed of 85km/h and 60km/h respectively in opposite direction.if they take 15s to pass each other compeletely,then find the length of one train,provided the length of the other is 140m
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relative motion theory
145 km/h = v(A,B)
distance = (l+140)by S=ut
then( l+(140/1000))/(1/4h)=85
by this l=340-1.4=338.6 m
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