Problem on Train

Level 1

A 270 metres long train running at the speed of 120 kmph crosses another train running in opposite direction at the speed of 80 kmph in 9 seconds. What is the length of the other train?


The answer is 230.

Anilsai Rangu by Anilsai Rangu , 28, India

This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try refreshing the page, (b) enabling javascript if it is disabled on your browser and, finally, (c) loading the non-javascript version of this page . We're sorry about the hassle.

3 solutions

Raj Maiti
Mar 22, 2014

Relative Speed = (120+80) km/hr = 200 km/hr Time=9 sec Distance Speed x Time =200 x {9/(60 x 60)} km =1/2 km =500 meter Length of other train = (500 - 270) meter = 230 meter

Answer :-- 230 km :)))

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Anilsai Rangu
Jan 18, 2014

Relative speed = (120 + 80) km/hr 

                          = 200 x 5/18  m/sec;
                          = 500/9   m/sec;

Let the length of the other train be x metres. Then, x/9 + 270/9 = 500/9 ; x + 270 = 500; x = 230.

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Noel Lo
Jul 9, 2018

Relative speed = 120 + 80 = 200 120+80=200 km/h = 200 3.6 \dfrac{200}{3.6} m/s. Distance covered = 200 3.6 ∗ 9 = 1800 3.6 = 500 \dfrac{200}{3.6}*9=\dfrac{1800}{3.6}=500 m. Thus length of the other train is 500 − 270 = 230 500-270=\boxed{230} m.

0 Helpful 0 Interesting 0 Brilliant 0 Confused

0 pending reports

×

Problem Loading...

Note Loading...

Set Loading...