Suman covers a certain distance by car, driving at 22 km/hr, and he returns to the starting point, riding on a scooter at a speed of 17 km/hr. Find the average speed for the whole journey.

Correct option is A

Given:
Speed of car = 22 km/hr
Speed of scooter = 17 km/hr
Formula Used:
​$$\text{Average Speed} = \frac{2 \times \text{Speed}_1 \times \text{Speed}_2}{\text{Speed}_1 + \text{Speed}_2}$$​​
Solution:
​$$\text{Average Speed} = \frac{2 \times 22 \times 17}{22 + 17}\\\ \\\text{Average Speed} = \frac{2 \times 374}{39}$$​​
Average Speed = 19$$\frac {7}{39}$$ km/hr.