Question

A train crosses a platform 100 m long in 60 s at a speed of 45 km/h. The time taken by the train to cross an electric pole is.​

Answer 1

Answer:

52 sec

Step-by-step explanation:

Speed of the train = 45 kmph = 45×518=252m/sec.

Let x be the length of the train.

The distance (length of train + length of the platform) is covered in 60 secs.

Time taken to cross (x+100) mts. at 252 at speed m/sec. = 60 sec.

= x+100252=60

(x+100)×2=60×25

2x + 200 = 1500

\2x = 1500 - 200 = 1300

x=13002 = 650 mts.

To find the time taken by the train to cross an electric post.

= length of the trainspeed per sec.

=650252=650×225 = 52 secs.