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A card driver...

Question

A card driver travels from the planes to a hill station which are 200 km apart at an average speed of 40 km/h. In the return trip, he covers the same distance at an average speed of 20km/h. The average speed of the car over the entire distance of 400 km is

16.56 km/h.

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17.89 km/h.

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26.67 km/h.

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35 km/h.

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None of these

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Solution

The correct option is C 26.67 km/h.
Average speed of entire distance of 400 km
$= \frac{t o t a l d i s t a n c e}{t o t a l t i m e}$
$= \frac{200 + 200}{\frac{200}{40} + \frac{200}{20}} = \frac{400}{5 + 10} = \frac{400}{15} = 26.67 k m / h$

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A card driver travels from the planes to a hill station which are 200 km apart at an average speed of 40 km/h. In the return trip, he covers the same distance at an average speed of 20km/h. The average speed of the car over the entire distance of 400 km is

The correct option is C 26.67 km/h.Average speed of entire distance of 400 km =total distancetotal time =200+20020040+20020=4005+10=40015=26.67km/h

The correct option is C 26.67 km/h.
Average speed of entire distance of 400 km
$= \frac{t o t a l d i s t a n c e}{t o t a l t i m e}$
$= \frac{200 + 200}{\frac{200}{40} + \frac{200}{20}} = \frac{400}{5 + 10} = \frac{400}{15} = 26.67 k m / h$