A car covers half the distance at a speed of $50$ $k m / h r$ and the other half at $40$ $k m / h r$ . Find the average speed of the car.

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Solution

$s = \frac{2 a b}{a + b}$
$a = 50$ $k m / h r$
$b = 40$ $k m / h r$
$\Rightarrow s = \frac{2 \times 50 \times 40}{50 + 40}$
$\Rightarrow s = 44.44$ $k m / h r$

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A car covers half the distance at a speed of 50 km/hr and the other half at 40 km/hr. Find the average speed of the car.

s=2aba+ba=50 km/hrb=40 km/hr⇒s=2×50×4050+40⇒s=44.44 km/hr

A car covers half the distance at a speed of $50$ $k m / h r$ and the other half at $40$ $k m / h r$ . Find the average speed of the car.

$s = \frac{2 a b}{a + b}$
$a = 50$ $k m / h r$
$b = 40$ $k m / h r$
$\Rightarrow s = \frac{2 \times 50 \times 40}{50 + 40}$
$\Rightarrow s = 44.44$ $k m / h r$