Question

Find the length of a train if it takes 10 seconds to cross a pole and double of this time to cross a platform of length 200 mts ?
A) 180 mts
B) 190 mts
C) 200 mts
D) 210 mts

Answer 1

Hii dear Here is ur answer



Option a is the right answer


Hope its help u

Answer 2

Answer:   C) 200 mts 

Explanation:

Let the length of the train be 'L' mts

let the speed of the train be 'S' m/s

Given it crosses a pole in 10 sec=> L/S = 10 ......(1)
Given it takes 20 sec (double of pole) to cross a platform of length 200 mts

=> (L + 200)/S = 20

=> L/S + 200/S = 20

But from (1) L/S = 10

=> 200/S = 20 - 10

=> S = 20 m/s

Then, from (1)

=> L = 10 x 20 = 200 mts.

Hence, the length of the train = 200 mts.