Question

A car covers the first half of the distance between two places at a speed of 40 km and the second half at 60 km $h^{-1}$. Find the average speed of the car.

• A. $100km{h}^{-1}$
• B. $50km{h}^{-1}$
• C. $48km{h}^{-1}$
• D. $52km{h}^{-1}$

Answer 1

The correct option is C $48km{h}^{-1}$

Average speed is $V=\frac{distance}{time}$

if a car travels first half with $V_1$ and second half of distance with $V_2$

then formula of average velocity is given by

$V=\frac{2V_2{V}_1}{V_1+V_2}=\frac{2\ast 60\ast 40}{60+40}=48km/h$