A car is moving on a straight road covers one third of the distance with a speed of 20 kn/hr and the rest with a speed of 60 km/hr. the average speed of the car is?

Let the total distance be 3*x*.

Time taken to cover one-third of the distance = *x*/20

Time taken to cover two-thirds of the distance = 2*x*/60 = *x*/30

Total time = *x*/20 + *x*/30 = 5*x*/60 = *x*/12

Average speed = (Total distance travelled)/(Total time taken) = (3*x*)/(*x*/12) = 36 km/hr

**
**