Question

a train crosses a platform 90m long in 30 seconds and a man standing on the platform in 15 secs. Find the speed of the train​
please answer my question...
and make me understand

Answer 1

Step-by-step explanation:

let speed of train be x m/s

if a train crosses an object with no length then

speed of train =length of train / time taken by train to cross the stable object

here the train is crossing a man standing on the platform in 15 sec

so , x = length of train /15

length of train = 15x meter

also the train is crossing the platform 90m long in 30 seconds

so speed of train =(length of train +length of platform)/time taken by train to cross the platform

x = 15x+90/30

30x=15x+90

30x-15x=90

15x=90

x=90/15

x=6

so speed of train is 6 m/s