Question

. A train of length 80 m long crosses a pole in 4 seconds. How long will it take to cross a railway platform of length 120 m?

Answer 1

Answer:

6 seconds

Step-by-step explanation:

length of train= 80m

time taken to cross the pole= 4 seconds

speed of the train= Distance travelled /time taken

=80/4

= 20 m/s

so time taken to cross a platform of 120 m->

time = Distance/speed

=120/20

=6 seconds

6 seconds is the answer

hope it helps you

Answer 2

$</p><p>\huge {\fbox{\fbox{\rightarrow {\mathfrak {\green{\tt{Answer \: - \: 10 \: Seconds . }}}}}}}$

$</p><p>\underline {\underline {\tt{\mathfrak {\orange {Step-By-Step-Explaination \:: }}}}}$

$</p><p>\blue{\huge{\boxed {\underline {\underline{\mathfrak{\bigstar{\tt{Question \: - }}}}}}}}$

A train of length 80 metre long crosses a pole in 4 seconds.

How long it will take to cross a railway platform of length 120 m?

$</p><p>\blue{\huge{\boxed {\underline {\underline{\mathfrak{\bigstar{\tt{Solution \: - }}}}}}}}$

$</p><p>\text{\tt{The pole is a stationary object of neglected length. }}}$

$</p><p>\text{\tt{It stands for obtaining the speed of the train from a frame of reference w.r.t observer. }}$

The length of the train is 80 metres.

It crosses the pole in 4 seconds.

Hence, Speed of train = 20 m/s.

The length of the railway platform is 120 metres.

The length of the train is 80 metres.

Total distance to cover = 120 + 20 = 200 metres.

Speed is 20 m/s.

Time taken = Distance / Speed = 10 seconds.

\tt{The train takes 20 seconds to cross the railway platform. }

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$</p><p>\huge {\boxed {\boxed {\underline {\mathfrak {End.... }}}}}$

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