Question

question in attachment​

Answer 1

Given :-

• Length of the train = 125 meters

• Time = 3.75 seconds

Required to find :-

• Speed of the train ? ( in km/hr )

Formula used :-

• $\Large{\leadsto{\boxed{\rm{ Speed = \dfrac{Distance}{Time } }}}}$

Solution :-

Given information :-

• Length of the train = 125 meters

>> Time = 3.75 seconds

• According to given information we can conclude that ;

• The distance travelled by the train = Length of the train

So,

>> Distance = 125 meters

we need to find the speed of the train .

Using the formula !

$\Large{\leadsto{\boxed{\rm{ Speed = \dfrac{Distance}{Time } }}}}$

>> Substitute the values <<

$\longrightarrow{\tt{ Speed = \dfrac{ 125 \ m }{ 3.75 \ s } }}$

• => Multiplying the numerator and denominator with 1000

$\longrightarrow{\tt{ Speed = \dfrac{125 \times 100 \ m}{3.75 \times 100 \ s}}}$

$\longrightarrow{\tt{ Speed = \dfrac{ 12500 \ m }{ 375 \ s } }}$

=> By reducing we get ;

$\longrightarrow{\tt{ Speed = \dfrac{ 100 }{ 3 } m/s }}$

Thus,

• Speed of the train = 100/3 m/s

But,

• It is mentioned that we need to find the speed in km/hr .

• Let's convert the speed from km/hr to m/s

As we know that ;

• 1 km/hr = 5/18 m/s

This implies

• 1 m/s = 18/5 km/hr

So,

$\longrightarrow{\rm{ \dfrac{ 100 }{3} \times \dfrac{ 18}{5} }}$

$\rightarrow{\rm{ \dfrac{ {\cancel{ 100 }}^{ 20 } }{ \cancel{3} } \times \dfrac{ {\cancel{18}}^{6} }{ \cancel{5} } }}$

$\rightarrow{\rm{ 20 \times 6 }}$

$\rightarrow{\rm{ 120 km/hr }}$

Therefore,

>> Speed of the train = 120 km/hr

Note:-

• learn the formula of speed for better understanding.

Answer 2

Answer:

multiply the 125 and 3.75 to each other

Explanation:

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