Question

10. A car travels 100km with a speed of 50km/hr and another 200km with a powt
speed of 20km/hr. Find the average speed.
25km/hr
35km/hr
55km/hr
O
30km/hr
please answer fast and I will make you the brainlinest ​

Answer 1

Given :

⇒ A car travels 100km at a speed of 50kmph and another 200km at a speed of 20kmph.

To Find :

➾ Average speed of car.

SoluTion :

➝ Average speed is defined as the ratio of total distance travelled to the total time taken.

➝ It is a scalar quantity having only magnitude.

➝ SI unit : m/s

$\leadsto\tt\:v_{av}=\dfrac{d_1+d_2}{t_1+t_2}$

$\leadsto\tt\:v_{av}=\dfrac{d_1+d_2}{\frac{d_1}{t_1}+\frac{d_2}{t_2}}$

$\leadsto\tt\:v_{av}=\dfrac{100+200}{\frac{100}{50}+\frac{200}{20}}$

$\leadsto\tt\:v_{av}=\dfrac{300}{2+10}$

$\leadsto\boxed{\bf{\purple{v_{av}=25\:kmh^{-1}}}}$