Question

answer this question​

Answer 1

your answer is 12 sec

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Answer 2

Question

A train 200 metres long and travelling at a speed of 60km/hr will cross a pole in ?

Given :

Speed of train 60km/h

Length if the train =200m

To Find :

Time ??

Solution

Explanation:

First we have to convert speed of train into m/s from km/h.

when we have to convert km/hr into m/s

$\sf\bold{=> \dfrac{km}{hr} = \dfrac{1000 \times m}{3600 \times s}}$

$\sf\bold{= > \dfrac{km}{h} = \dfrac{5}{18} \times \dfrac{m}{s}}$

$\sf\: Speed=\bigg(60 \times \dfrac{5}{18}\bigg ) = \dfrac{50}{3}$

Speed is (50/3)m/s

Length of the train =$\sf \bold{Speed \times Time}$

$\sf= > 200m = \dfrac{50}{3} T$

$= > T = 200 \times \dfrac{3}{50} = 4 \times 3 = 12$

$\therefore$Time is 12 seconds.