A truck travels 80 km at the speed of 40 km/hr and the next 44 km at the speed of 9 km/hr. What is its average speed (in km/hr)?​

Correct option is D

Given:

The truck travels 80 km at the speed of 40 km/hr.

The truck then travels 44 km at the speed of 9 km/hr.

We need to find the average speed of the truck.

Formula Used:

Average speed = $$\frac{\text{Total distance}}{\text{Total time}}$$ 

Solution: ​

Average speed = $$\frac{80 +44}{\frac{80}{40}+\frac{44}{9}} = \frac{124}{\frac{62}{9}} = 18 \ km/h$$​​