A train passes over a 400 m long bridge .if the speed of train is 30 m per s and train takes 20s to cross the bridge find the length of train

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Dear Student,
$l e t t o t a l l e n t h o f t h e t r a i n i s l t h e n d i s \tan c e c o v e r b y t h e t r a i n i n 20 s i s 400 + l w e k n o w s p e e d = \frac{d i s \tan c e}{t i m e} 30 = \frac{400 + l}{20} \Rightarrow l = 600 - 400 = 200 m$
Regard

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A train passes over a 400 m long bridge .if the speed of train is 30 m per s and train takes 20s to cross the bridge find the length of train

Dear Student, let total lenth of the train is l then distance cover by the train in 20s is 400+lwe know speed =distance time 30=400+l20⇒l=600-400=200m Regard

Dear Student,
$l e t t o t a l l e n t h o f t h e t r a i n i s l t h e n d i s \tan c e c o v e r b y t h e t r a i n i n 20 s i s 400 + l w e k n o w s p e e d = \frac{d i s \tan c e}{t i m e} 30 = \frac{400 + l}{20} \Rightarrow l = 600 - 400 = 200 m$
Regard