Question

A man run 500 meters in 100 seconds . Find his speed in km/h

Answer 1

Answer:

The answer is 18km/h

Step-by-step explanation:

Using     $\displaystyle \text{Speed}=\frac{\text{distance}}{\text{time}}$

Required speed

                $\displaystyle =\frac{500 \text{ m}}{ 100\text{ second}}$

                $=\displaystyle \frac{500\times \frac{1}{1000}\text{km}}{100\times \frac{1}{3600}\text{h}}\\\\=\frac{\frac{1}{2}}{\frac{1}{36}}\text{km/h}\\\\\\=\frac{36}{2}=18\text{km/h}$

Answer 2

Given,

Distance, d = 500 m

Time , t = 100 sec

Speed v = ?

$v=\dfrac dt \\\\\implies v =\dfrac{500~ m}{100 ~s} = 5 ms^{-1} = \dfrac{5 \times 3600}{1000} = \dfrac{18000}{1000}=18~ kmh^{-1}$