Question

a train takes 4 sec to pass a telegraph post and 20 sec to pass 264m long bridge. let us find the length of the train and also its speed.​

Answer 1

Answer:

length of the train=66m

and speed of the train=14m/s

Step-by-step explanation:

to find length of train and speed of train.

let length of train to be. Xm

given length of bridge is 264m

velocity=distance/time

total distance cover by train is 264+Xm

v=264+X/20..........(1)

distance cover by telegraph is X

now,

V= X/4...........(2)

comparing an equation 1and 2

we get

264+X/20=X/4

= 4X=264

= X= 66m

put value of X in equation 2

we have

66/4= 14m/s

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