A passenger train 80 meters long takes half a minute in crossing a tunnel 420 long . What is the speed of the train .
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the distance covered is 420+80=500m
time=30sec
s=d/t
= s= 500m/30= 50/3 m s^-1
= 1kmp minute and 60 kmph
time=30sec
s=d/t
= s= 500m/30= 50/3 m s^-1
= 1kmp minute and 60 kmph
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