A car travels the first half of a distance between two places at a speed of $30 k m / h r$ and the second half of the distance at $50 k m / h r .$ . The average speed of the car for the whole journey is

42.5 k m / h r

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40.0 k m / h r

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37.5 k m / h r

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35.0 k m / h r

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Solution

The correct option is C $37.5 k m / h r$
When the object covers half the distance with speed $v_{1}$ and other half with speed $v_{2}$ ,the average speed is given by :
$S$ = $\frac{2 v_{1} v_{2}}{v_{1} + v_{2}}$ = $\frac{2 (30) (50)}{30 + 50}$ = $37.5 k m / h r$

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A car travels the first half of a distance between two places at a speed of 30km/hr and the second half of the distance at 50km/hr. . The average speed of the car for the whole journey is

The correct option is C 37.5km/hrWhen the object covers half the distance with speed v1 and other half with speed v2 ,the average speed is given by :S = 2v1v2v1+v2 = 2(30)(50)30+50 = 37.5km/hr

A car travels the first half of a distance between two places at a speed of $30 k m / h r$ and the second half of the distance at $50 k m / h r .$ . The average speed of the car for the whole journey is

The correct option is C $37.5 k m / h r$
When the object covers half the distance with speed $v_{1}$ and other half with speed $v_{2}$ ,the average speed is given by :
$S$ = $\frac{2 v_{1} v_{2}}{v_{1} + v_{2}}$ = $\frac{2 (30) (50)}{30 + 50}$ = $37.5 k m / h r$