A car covers half of the distance with speed $60 k m / h r$ and rest of the half with speed $30 k m / h r$ . The average speed of the car is -

45 k m / h r

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40 k m / h r

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20.0 k m / h r

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50 k m / h r

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Solution

The correct option is D $40 k m / h r$
Let the total distance is $s$ and the total time is $t$ .

The average velocity is given as,

$v = \frac{s}{t}$

$v = \frac{s}{t_{1} + t_{2}}$

$v = \frac{s}{\frac{(s / 2)}{60} + \frac{(s / 2)}{30}}$

$v = 40 k m / h r$

Thus, the average speed is $40 k m / h r$ .

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