Question

A boy travelled a distance of 120km in 4 hours calculate speed of a body in m/s

Answer 1

Given :-

• Distance covered = 120km
• Time = 4 hours

Aim :-

• To find speed in m/s

Answer :-

CONVERSION :

We know that,

${\boxed{\begin{array}{cc}\sf \rightarrow 1000m = 1km \\\sf \rightarrow ?m = 120km \\\sf \rightarrow 120000m = 120km \end{array}}}$

${\boxed{\begin{array}{cc}\sf \rightarrow 3600\:seconds = 1\:hour \\\sf \rightarrow ?s = 4\:hours \\\sf \rightarrow 14400\:seconds = 4\:hours \end{array}}}$

FORMULA :

To find the speed, the following formula must be used.

$\longrightarrow \sf Speed = \dfrac{Distance}{Time}$

Substituting the values,

$\implies \sf Speed = \dfrac{120000}{14400}$

$\implies \sf Speed = \dfrac{1200\not0\not0}{144\not0\not0}$

Reducing to the lowest terms,

$\implies \sf Speed = \dfrac{25}{3}$

$\longrightarrow \sf Therefore,\: Speed\: in\: m/s\: is\: \dfrac{25}{3}m/s$

Some more formulas :-

$\to \sf Distance = \dfrac{Speed}{Time}$

$\to \sf Time = \dfrac{Distance}{Speed}$