Question

a car is moving on a.straight roadcovers one third of his distance with a speed of 20 km/hr and then rest with a speed of 60 km/hr then average speed of car is​

Answer 1

Answer:

36 km/ hr

Explanation:

let distance be x km

then for x/3 distance , time = x/60 hr

and for 2x/3 distance , time= x/90 hr

now average speed = total distance by total time

= x/ (x/60+x/90)

=x×540/15x

x= 36 km/ hr