Time, Speed & Distance

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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:


48 km/hr


37 km/hr


44 km/hr


45 km/hr

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Option(A) is correct

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

Total time taken,


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


Average speed,


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

$= \textbf{48 km/hr}$

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

(2) Comment(s)

Vejayanantham TR


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

Suhail Ahmed

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