# Easy Time, Speed & Distance Solved QuestionAptitude Discussion

 Q. A car travels first half distance between two places with a speed of 40 km/hr and rest of the half distance with a speed of 60 km/hr. The average speed of the car is:
 ✔ A. 48 km/hr ✖ B. 37 km/hr ✖ C. 44 km/hr ✖ D. 45 km/hr

Solution:
Option(A) is correct

Let, the total distance covered be $S$ km.

Total time taken,

$=\dfrac{S/2}{40}+\dfrac{S/2}{60}$

$=\dfrac{S}{2\times 40}+\dfrac{S}{2\times 60}$

$=\dfrac{5S}{240}$

Average speed,

$=\dfrac{S}{\left(\frac{5S}{240}\right)}$

$=S\times \dfrac{240}{5S}$

$= \textbf{48 km/hr}$

Edit: For a quick formula based alternative solution, check comment by Vejayanantham TR.

## (3) Comment(s)

Vatsan
()

The above formula can be applied, only if the distance travelled is the same.

Vejayanantham TR
()

$\dfrac{2xy}{x+y}$

$\dfrac{2*40*60}{40+60} = 48$

Suhail Ahmed
()

$=\left( \dfrac{2\times S1\times S2 }{(\frac{S2}{S1})}\right)$