Question

a train running at a speed of 108 km / hr. It crosses a 365 m long platform in 21 sec. what is the length of the train​

Answer 1

get the length of the train Be X

actual distance travelled by the train to cross the platform is 365+X

the speed of the train is 108 km per hr which is equal to30 m per s

time taken is 21 second

velocity is equal to distance upon time

therefore

v=d/t

30=(365+X)/21

630=365+X

X=265m....(ans)

therefore length of the train is 265 m....

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Answer 2

Answer is 265 m

Step-by-step explanation:   speed of train in m/s =  108×5/18= 30m/s

                                                 time taken  =   21 sec

                                                     distance = v×t

                                                                      = 30×21  =630 m

length of train   = distance of train - length of platform

                            =  630  -   365 = 265 m