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

Step-by-step explanation:

let x be the length of the train.

It's speed becomes=x/4

now the distance is =x+264

time is =20sec

speed=x+264/20

comparing the speeds

x/4=x+240/20

5x=x+240

4x=240

x=60m

speed=60/4=15 m/s