Question

the speed of the train is 4km/hr if the length of the train is 123m and length of platform is 177m then the time taken by the train to pass the platform is​

Answer 1

$\rule{400}{4}$

Question :-

The speed of the train is 4km/hr of the length of the train is 123m and the length of platform is 177m then the time taken by the train to pass the platform is ?

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Answer :-

Given :-

✥ Speed of the train is 4km/hr .

✥ Length of the train is 123 meters .

✥ Length of the platform is 177 Meters .

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Required to find :-

✥ Time taken by the train to pass the platform is ?

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Formula used :-

$\huge{\underline{\boxed{\tt{ Time = \dfrac{Distance}{Speed}}}}}{\bigstar}$

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Units Conversion :-

Before Solving this question we need to convert some units .

Here, the required physical quantity which needs to be converted is distance .

Why we need to convert speed is in the a question the distance is given in Meters .

But, whereas the units of speed is given in kilometres per hour .

So,

Here we need the convert the distance from Meters into kilometres

Hence, in order to convert them we have to divide the given value with 1000 .

So,

The length of the train is 123 metres

==> 123/1000 = 0.123 kilometres

Similarly,

The length of the platform is 177 Meters

==> 177/1000 = 0.177 Meters

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Solution :-

Given :-

Speed of the train = 4 km/hr .

Length of the train = 0.123 Meters .

Length of the platform = 0.177 Meters .

Total distance = ?

Length of the train + Length of the platform

0.123 + 0.177

= 0.3 kilometres

Since,

By using the above formula we can find the time taken by the train to pass the platform .

The formula is ,

$\huge{\underline{\boxed{\mathrm{ Time = \dfrac{Distance}{Speed}}}}}$

Now substitute the required values ,

Hence we get ,

$\tt{ Time = \dfrac{0.3}{4}}$

$\red{\underline{\underline{\tt{0.075 \; hours}}}}$

Here the values is bit difficult to understand so let's convert this hours into minutes .

To convert hours into minutes multiply it with 60 .

So,

$\mathrm{ 0.075 \times 60 }$

$\mathrm{ 4.5 minutes }$

$\red{\large{\underline{\boxed{\implies{4 \; minutes \;\;and \;\;5 \; seconds }}}}}{\blue{\bigstar}}$

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Answer 2

Answer:

20 second answer is right