Question

A train speeds past a pole in 15 seconds and a platform 100 m long in 25 seconds. Its length is:

A) 50 m B) 150 m C) 200 m D) data inadequate

Answer 1

Answer:

the correct option is D as the result comes out 60 but that option isn't mentioned here.

In case 1

speed =distance/15 m/s

In case 2

speed=100/25 m/s

speed=4m/s

from case 2,substitute the value of speed in case case 1

=> 4=distance/15

distance =60

Answer 2

Answer:

I50 m

Step-by-step explanation:

let the length of the train be x and speed y

x/y=15

y=x/15

Therefore x+100/25=x/15

15(x+100)=25

15x+1500=25x

1500=10x

x=150