Question

A train is running at a speed of 36 km/hr. It crosses a pole in 20 seconds.
a) 250 m (b) 200 m (c) 220 m (d) 180 m​

Answer 1

Answer:

d.180 m

this is your ans.

Answer 2

Answer:

Option (b) 200 m is the length of the train

Step-by-step explanation:

Given :

Speed of the train = 36 km/hr

Time taken by train to cross the pole = 20 seconds

(Here , the question is not clear that we have to find what . Like this questions I know that there we have to find the length of the train . So , I will find the length of the train ......)

To find :

The length of the train

Concept :

First covert the speed if train in m/s to convert it in m/s use this formula -:

$\boxed{\sf{S\times\dfrac{5}{18}}}$

Where,

S = Speed of the train (km/hr)

So , the Distance = Length of the train . After that use the distance formula to find the length of the train -:

$\boxed{\sf{D=S\:\times\:T}}$

D = Distance

S = Speed (m/s)

T = Time

Solution :

Speed in m/s -:

$\leadsto\sf{\cancel{36}km/hr\times\dfrac{5}{\cancel{18}}}$

$\leadsto\sf{2\times5}$

$\leadsto\sf{10m/s}$

Length of the train -:

$\leadsto\sf{D=10m/s\times20s}$

$\leadsto\sf{D=200m}$

So , the length of the train is 200m .