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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

A
16.56 km/h.
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B
17.89 km/h.
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C
26.67 km/h.
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D
35 km/h.
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E
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
=total distancetotal time
=200+20020040+20020=4005+10=40015=26.67km/h

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