Question

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

Answer 1

Explanation:

18Q:

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: B) 150 m

Explanation:

Let the length of the train be x metres and its speed be y m/sec.

Then, (x/y)= 15 y =(x/15)

(x+100)/25 = x/15

=> 15(x + 100) = 25x

=> 15x + 1500 = 25x

=> 1500 = 10x

=> x = 150 m.