Question

train 360 metre long is running at a speed of 45 kilometre per hour and crosses the platform in 40 seconds find the length of the platform​

Answer 1

Step-by-step explanation:

consider the front most part, it also moves at the speed of 45kmph

=(45×1000)/(60×60)mps

=12.5mps(metres per second)

the train covers 12.5m in one second,

therefore, in 40 seconds, it will cover:

40×12.5=500m

but the length of the train should be subtracted,

500-360=140m

Answer 2

Step-by-step explanation:

Given: length of train= 360m

speed of train=45km/hr

time taken = 40sec

length of platform =x

total lenth =360+x

solution: 45km/hr=5/18×45

=12.5m/s

speed=distance/time

distance =speed×time

360+x =12.5×40

x=500-360

x=140m

therfore length of platform is 140m