Question

a man walks 20 km in 4 hours. find his speed in km/h and m/s. pls find this answer​

Answer 1

$\huge\bold{\color{aqua}{Solution :-}}$

$\bold{\blue{Distance\: covered\:by\:man\:}=\:\green{20\:km}}$

$\bold{\blue{Time\:Taken\:}=\:\green{4\:hours}}$

$\bold{\purple{\text{We know that }}}$

$\quad\bold{\blue{Speed}=\orange{\frac{Distance\: covered}{Time\:taken}}}$

$\Rightarrow\bold{Speed=\frac{20}{4}\:km/h}$

$\Rightarrow\bold{Speed=\frac{\red{\cancel{\blue{20}}}^{\green{\:5}}}{\red{\cancel{\blue{4}}}}\:km/h}$

$\Rightarrow\green{\boxed{\bold{\red{Speed}=\pink{5\:km/h}}}}$

$\Rightarrow\bold{Speed=5×\frac{1000}{60×60}\:m/s}$

$\Rightarrow\bold{Speed=\frac{5000}{3600}\:m/s}$

$\Rightarrow\bold{Speed=\frac{50\red{\cancel{\blue{00}}}}{36\red{\cancel{\blue{00}}}}\:m/s}$

$\Rightarrow\bold{Speed=\frac{50}{36}\:m/s}$

$\Rightarrow\bold{Speed=\frac{\red{\cancel{\blue{50}}}^{\green{\:25}}}{\red{\cancel{\blue{36}}}^{\green{\:18}}}\:m/s}$

$\Rightarrow\bold{Speed=\frac{25}{18}\:m/s}$

$\Rightarrow\bold{Speed=\frac{\red{\cancel{\blue{25}}}^{\green{\:1.39}}}{\red{\cancel{\blue{18}}}}\:m/s}$

$\Rightarrow\green{\boxed{\bold{\red{Speed}=\pink{1.39\:m/s}}}}$