Answer:
Average speed of car will be 48 km/hr
Explanation:
Let the total distance is 2d
It is given that first half of the distance car travels with a speed of 40 km/hr
So time taken to cover half of the distance [tex]t_1=\frac{d}{40}hr[/tex]
Second half of the distance is covered with a 60 km/hr
So time taken to cover second half of the distance [tex]t_2=\frac{d}{60}hr[/tex]
So total time to cover 2d distance [tex]t=\frac{d}{60}+\frac{d}{40}=\frac{5d}{120}[/tex]
Average speed is the ratio of total distance to total time
So average speed [tex]=\frac{2d}{\frac{5d}{120}}=48km/hr[/tex]
So average speed of car will be 48 km/hr
